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The statement that the times of opposition and closest approach differ by up to 8.5 days does not mean the gap between successive oppostions varies by 8.5 days. That varies by much more. Example: in 2037, Mars reached a minimum of 73.838 Gm on Novemeber 11.3332, and eight days later, on Nov 19.382,5 reached opposition with a distance of 74.74066 Gm. The statement says the gap can be as much as eight and a half days. Saros136 (talk) 03:52, 1 October 2010 (UTC)
The opposition primer is referring to close approaches, not oppositions, in the bottom table. The wording is misleading, granted. Higher up they discuss the fact that close approaches do not occur at the same instant as an opposition, and in one table make it clear they refer to the approaches in the vicinity of the oppositions. Good, but some later numbers are referred to as the distance at oppositions. Inspection of the table shows that it is indeed the time of close approach. The Mars opposition of 2003 did not happen on the 27th. The other reference, that I deleted, only covers decades, not nearly enough the a sentence mentioning an approach distance that has not been reached for tens of thousands of years. I'm substituting the number for greatest close approaches, form Solex. Saros136 (talk) 22:01, 2 October 2010 (UTC)
The caption under the picture of Mars says it's from the Hubble, but the pic info says it's a "Global mosaic of 102 Viking 1 Orbiter images" —Preceding unsigned comment added by 94.196.177.210 (talk) 09:33, 12 October 2010 (UTC)
The following statement was tagged as unverified in the article, so I'm moving it here for cleanup.
The source listed for this statement was:
{{cite book}}
: External link in |title=
(help)It looks like a valid source, but it does not confirm the statement. I haven't found any other source that will confirm the statement either, so at this point it is looking like possible misinformation. What the source does say is that the author of the Vishnu-Purâna lists distances between the planets, but there is nothing about them being measured using astronomical instruments. Yaqūb ibn Tāriq was noted mainly for his translation of Indian astronomy texts.
If somebody can provide a reliable source, then we can move the statement back into the article. Thanks.—RJH (talk) 18:06, 9 November 2010 (UTC)
the first paragraph tells us this is a star with a lower metallicity then the sun, whence it is not supposed to easily form rocky planets, but also says it has a ten times more massive debris disk then the sun. i think that is kinda paradoxal, since my understanding is more debris actually promotes the formation of planets, so either the indicator of metallicity for rock is flawed (it surely seems so), and i think since secondary factors but the primary star play significant roles in the formation of debris disks it is the most logical,(the inference of planets for metallicity then being "spurious") or it remains completely unexplained that there is a relation between a lot of debris but still not a planet (wich seems illogical), i don't mind paradoxes much personally, they keep me thinking, but i wonder what it contributes to our understanding of star systems.24.132.171.225 (talk) 08:45, 7 February 2010 (UTC)
Someone showed me this, which might me of interest to the article. Don't know anything about anything though, and it's probably a hoax.
http://projectavalon.net/forum/showthread.php?t=18677 —Preceding unsigned comment added by 62.72.110.11 (talk) 09:48, 9 June 2010 (UTC)
Hello everyone! This article currently appears near the top of the cleanup listing for featured articles, with six cleanup tags. Cleanup work needs to be completed on this article, or a featured article review may be in order. Please contact me on my talk page if you have any questions. Thank you! Dana boomer (talk) 17:51, 8 November 2010 (UTC)
Tags I have noticed:
-- Kheider (talk) 18:51, 8 November 2010 (UTC)
I have a few comments to add to the first two bulleted tag items above. To say "Unlike Earth, Mars is now geologically and tectonically inactive" is imprecise and probably incorrect. First, what does "geologically" inactive mean? Mars has a lot of active geological processes today (e.g. mass wasting, wind erosion and deposition, etc.). Second, if the phrase is meant to mean no internal (volcanic, tectonic) processes are active, this would have to be based on seismology and heat flow data. Only one seismometer has operated on Mars (Viking 2), which did record a low-magnitude quake. Golombek et al. (1992) suggests that Mars remains seismically active at the present time. Mars is probably still volcanically active too, although at a very low rate. We currently have no heat-flow data, so it's unknown exactly how warm Mars' interior currently is or isn't.
As for the second item, my understanding is that the anlayses of Martian meteorites and models of Mars' bulk density suggest that its mantle is enriched in iron as iron oxide (FeO). Some theories hold that Mars accreted from two populations of plantesimals: One was rich in metallic iron, and the other rich in water. The two were able to chemically interact early in Mars' history (before all the iron sank to the core) to form FeO and hydrogen, with the hydrogen readily escaping into space. See Boyce, J. (2009) The Smithsonian Book of Mars, for a discussion of the topic for general readers, and Barlow, N. (2008). Mars: An Introduction to Its Interior, Surface and Atmosphere, for more details. Hope this adds to the discussion. Schaffman (talk) 23:14, 11 December 2010 (UTC)
The article says: "Martian surface temperatures vary from lows of about -87 °C during the polar winters to highs of up to -5 °C in summers."
But another source (MarsNews.com :: Focus Sections :: The Planet Mars) says: 『While the average temperature on Mars is about 218 K (-55 °C, -67 F), Martian surface temperatures range widely from as little as 140 K (-133 °C, -207 F) at the winter pole to almost 300 K (27 °C, 80 F) on the dayside during summer』(I suppose this is in the equatorial areas).
Another interesting fact is this: "The meteorology mast on the lander has observed a rapid drop-off in temperatures just a few feet above the surface, and one detailed 24-hour measurement set revealed temperature flucuations of 30-40 degrees Fahrenheit in a matter of minutes." MARS PATHFINDER WINDS DOWN AFTER PHENOMENAL MISSION. But this was written in 1997, so new relevant information could have collected since then. Hipporoo (talk) 04:55, 5 December 2010 (UTC)
We've known for a long time that the temperature at the winter poles can drop to 140K, the condensation temperature of CO2 on Mars [Leighton, R.B.; Murray, B.C. (1966). Behavior of Carbon Dioxide and Other Volatiles on Mars. Science, 153(3732), 136–144.] This is about -133° C. The way the article is worded now:『...lows of about -87 °C during the polar winters..』is wrong and needs to be fixed.Schaffman (talk) 22:08, 11 December 2010 (UTC) 22:06, 11 December 2010 (UTC)
Yep, we'd have had a successful Mars Climate Orbiter mission, too. Schaffman (talk) 00:00, 12 December 2010 (UTC)
is there life on mars —Preceding unsigned comment added by 70.24.115.84 (talk) 23:15, 6 December 2010 (UTC)
Nobody knows. Schaffman (talk) 22:25, 11 December 2010 (UTC)
Hello everyone! The article states in relation to Phobos『In about 50 million years it will either crash into Mars’ surface or break up into a ring structure around the planet.』This information was taken from http://nineplanets.org/phobos.html By Bill Arnett; last updated: 2004 Nov 20. However on May 10th 2008 Dr. Bijay Kumar Sharma submitted an article about this subject. In the article he recalculates the descent of Phobos and found that Phobos has much less time left and will crash into Mars in 10.4 Million Years. He also states that Phobos will reach the Roche Limit in 7.6 Million Years, at that point Phobos will break apart into a Saturn-like ring. Information about Dr. Sharma's article can be found at: http://arxiv.org/abs/0805.1454 Here is a direct link to the article itself in PDF format: http://arxiv.org/ftp/arxiv/papers/0805/0805.1454.pdf WNSwins (talk) 02:41, 13 December 2010 (UTC)
The age of the Hesperian/Amazonian boundary given in the article (1.8 bya) is a lot younger than what is most commonly cited. Although the absolute age is very uncertain and could vary by a factor of 2, I've seen it usually given as somewhere between 3.2 and 2.0 bya. (See Hartmann and Neukum, 2001 and Hartmann, 2005.) A readily accessible discussion of this is in Hartmann, W.K. (2003) Traveller's Guide to Mars; Workman: New York, pp. 33-34. Schaffman (talk) 20:10, 18 December 2010 (UTC)
Is the atmospheric pressure indicated representative of the mass of the atmosphere independent of gravitation, or is it as per definition of pascals, a measure of actual pressure exerted in the Martian gravity field? Lucy Skywalker (talk) 21:47, 2 January 2011 (UTC)
In the first paragraph under the 'Life' section it is stated that the Martian surface is acidic. However in the third paragraph in the same section it is stated that the soil has a very alkaline pH. These appear to be contradictory statements. Can someone who knows the correct conditions of the surface/soil. please resolve this apparent conflict? --Ddraig2 (talk) 01:01, 4 January 2011 (UTC)
Actually I was referring to the last sentence in the 1st paragraph: "....Martian surface would have been too salty and acidic to support terrestrial life". A pH of 8.3 is not acidic under anyone's definition. I would also comment that the statement 'basic acidity' is an oxymoron. I am a chemist and the use of the term 'acidity' as a synonym for 'pH' while popularly used is scientifically unsupportable. Something can be acidic, or basic, or neutral (Ddraig2).
{{edit semi-protected}}
NASA Mars resources: http://mars.jpl.nasa.gov
Nightdave (talk) 20:47, 18 January 2011 (UTC)
Is there any area of this article that could be shunted off to a sub-article to trim its massive length? Serendipodous 09:31, 26 January 2011 (UTC)
If I am reading the section correctly, the pressure of Mars' atmosphere changes more slowly with altitude than it does on Earth. So does anyone know what the pressure would be at the bottom of the deep sections of Valles Marineris, 7 km down. Maury Markowitz (talk) 22:27, 28 January 2011 (UTC)
According to IUPAC recommendations (see IUPAC Green Book http://old.iupac.org/publications/books/gbook/green_book_2ed.pdf and also page 1387-1388 of http://www.iupac.org/publications/pac/67/8/1377/pdf), the units ppm, ppb and ppt should not be used. That's why I have replaced them. Also, I think that chemists as well as astronomers understand the meaning of the prefixes mu for 1E-6 and n for 1E-9. Please let's discuss this here and not start an edit war! RolfSander (talk) 22:52, 4 March 2011 (UTC)
RolfSander (talk) 00:53, 5 March 2011 (UTC)
I don't believe that this information is necessarily readily available. For example, the NASA Mars Fact Sheet provides abundances in ppm without specifying the type. I suspect the convention is to use whatever form is most readily measured spectroscopically, which I would presume is by number.—RJH (talk) 16:10, 8 March 2011 (UTC)
The section about water-worn structures on Mars under Hydrology is muddled (as was the source material under Water on Mars, to be fair). The description of the outflow channels is OK, but IMO spends too long on reasoning against the water origin without also presenting the evidence for water origin. More pressingly though, as in the daughter article, there's a critical confusion here between the dendritic, Noachian, valley networks and the huge, single thread, Hesperian outflow channels. These are fundamentally different things, well recognised as such in the literature, and it is in fact the valley networks that present the more compelling evidence for a warm, wet early Mars (which is surely where this section should be headed). This is totally unclear as the article stands.
If no-one has any comments, I'll make a discreet rewrite of this section for clarity at some point in the near future. And given the FA status of the article, I promise not to muck it up. And also not to noticeably increase the length!
DanHobley (talk) 03:16, 31 March 2011 (UTC)
I know this will sound pedantic to some, but Noachian, Hesperian, and Amazonian are periods, not epochs. The epochs are subdivisions of the periods (e.g. early Noachian, middle Noachian, late Noachian, etc.). I think the article should comply with standard stratigraphic nomenclature. I can change this if no one objects. Schaffman (talk) 14:01, 18 April 2011 (UTC)
In the Climate section it says that temperatures in the south varies by 30C (86F) more than they do in the north. This is wrong as it is a relative temperature not an absolute one 30C corresponds only to 54F. —Preceding unsigned comment added by 93.162.119.14 (talk) 05:38, 27 April 2011 (UTC)
"Hf-W-Th evidence for rapid growth of Mars and its status as a planetary embryo" by Dauphas and Pourmand: Mars allegedly is a "oligarch", a protoplanet, while Earth is some kind of later collision product. Rursus dixit. (mbork3!) 10:43, 31 May 2011 (UTC)
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Please change
{{Vertical images list|align=right|image1=Karte Mars Schiaparelli MKL1888.png|image2=Lowell Mars channels.jpg|image3=Mars HST Mollweide map 1999.png|width=200px|caption1=Map of Mars by Giovanni Schiaparelli|caption2=Mars sketched as observed by Lowell sometime before 1914. (South top)|caption3=Map of Mars from [[Hubble Space Telescope]] as seen near the 1999 opposition. (North top)}}
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{{multiple image|direction=vertical|width=200|image1=Karte Mars Schiaparelli MKL1888.png|image2=Lowell Mars channels.jpg|image3=Mars HST Mollweide map 1999.png|caption1=Map of Mars by Giovanni Schiaparelli|caption2=Mars sketched as observed by Lowell sometime before 1914. (South top)|caption3=Map of Mars from [[Hubble Space Telescope]] as seen near the 1999 opposition. (North top)}}
This rest of the article is using {{multiple image}} and this will make the caption font and image margins uniform throughout the article. Thank you. 198.102.153.2 (talk) 22:32, 2 June 2011 (UTC)
I did some trimming of the images in this article because it was getting steadily bloated with new additions, which significantly impacts the article download time. There is already a Mars gallery on the commons. Regards, RJH (talk) 19:09, 6 June 2011 (UTC)
A recent edit summary:
On Earth, sea level may be the median altitude but it is not the mean altitude, and local gravity is not constant on the geoid (though potential energy ought to be). Nor is "sea level" on Mars defined as a mean of anything.
The geoid is defined as a surface perpendicular to local gravity, which on the oceans coincides with mean sea level. An areoid can be defined similarly, but I'm less sure that atmospheric pressure (which defines 'sea level' on Mars) would be constant on such a surface, and I'm confident that local gravity would not be. —Tamfang (talk) 04:26, 28 June 2011 (UTC)
Equatorial surface gravity is given as 3.711 m/s² = 0.376 g; but 3.711/9.81 = 0.378. —Tamfang (talk) 03:50, 26 March 2011 (UTC)
What are the extremes (polar and equatorial)? —Tamfang (talk) 19:16, 26 March 2011 (UTC)
Using the given numbers for mass, equatorial and polar radius, and equatorial rotation speed, and applying the spherical approximation, I get polar gravity 3.7582 and equatorial gravity 3.6970 m/s²; but GM/R² is accurate only when the mass is spherically symmetric, and besides I don't know how much the Tharsis bulge affects the gravity. So I wish I knew where to look for better estimates of the gravity at the poles and at the top of Pavonis Mons. —Tamfang (talk) 23:58, 6 April 2011 (UTC)
Infact,Mars can be lived on!It might have some water.It might or might not have oxegin.But that is ok.Because we can take care of that.The best way of getting oxegin is planting plants on it. — Preceding unsigned comment added by 137harnsberrya (talk • contribs) 00:28, 6 August 2011 (UTC)
Параметр | English Wikipedia | Allen's astrophysical quantities, 2000:294-297 [1] | NASA [1] [2] | NASA [2] [3] | NASA [3] [4] |
---|---|---|---|---|---|
Semimajor axis of orbit | 227,939,100 km 1.523 679 AU | 227.93664×106km 1.52366231 AU | 227.92×106km | 227,943,824 km 1.523662 A.U. | - |
Orbital period | 1.8808 Julian years, 686.971 days | 1.88071105 Julian years (Sideral) | 686.980 days | 1.8808476 Earth years, 686.98 Earth days | 1.8808476 y |
Synodic period | 779.96 days | 779.9361 days | 779.94 days | - | - |
Eccentricity | 0.093315 | 0.09341233 | 0.0935 | 0.0933941 | - |
Inclination to ecliptic | 1.850° to ecliptic | 1.85061 (deg.) | 1.850 (deg.) | 1.85 degrees | - |
Longitude of ascending node | 49.562° | 49.57854 (deg.) | - | - | - |
Equatorial radius | 3,396.2 ± 0.1 km | 3397 km | 3396.2 km | - | 3396.19 ±.1 |
Volume | 0.151 Earths, 1.6318×1011 km³ | 0.149 Earths | 0.151 Earths, 16.318×1010 km³ | 0.151 Earths, 1.63116×1011 km³ | - |
Mass | 6.4185×1023kg | 0.64191×1027g | 0.64185×1024kg | 6.4169×1023kg | 0.641693±.000064 ×1024kg |
Density | 3.9335 ± 0.0004 g/cm³ | 3.94 g/cm³ | 3933 kg/m³ | 3.934 g/cm³ | 3.9340±.0008 g/cm³ |
Equatorial surface gravity | 3.711 m/s² | 371 cm/s² | 3.71 m/s² | 3.71 m/s² | 3.71 m/s² |
Escape velocity | 5.027 km/s | 5.02 km/s | 5.03 km/s | 5.030×10³ m/s | 5.03 km/s |
Sideral rotation period | 1.025 957 day | 1.025 956 75 day / 1.025 956 754 3 days | 24.6229 hrs | 1.026 Earth days 24.623 hours | 1.02595676 d |
Axial tilt (Inclination equator to orbit, Obliquity to orbit) | 25.19° | 25.19 (deg.) | 25.19 | 25.2 | - |
North pole right ascension | 317.681 43° | 317.681° | 317.681 - 0.106T | - | - |
North pole declination | 52.886 50° | 52.886° | 52.887 - 0.061T | - | - |
File:HORIZONS Mars data 2007 08 08.png - screenshot NASA's site on date 2007 08 08 for compare with card. Марсианский хро (talk) 17:02, 16 August 2011 (UTC)
Parameter | English Wikipedia | Source (ssd.jpl.nasa.gov/horizons.cgi on 2007-Aug-08) | Conclusion |
---|---|---|---|
Aphelion | 249,209,300 km | not in source | [citation needed] |
-"- | 1.665 861 AU | not in source | [citation needed] |
Perihelion | 206,669,000 km | not in source | [citation needed] |
-"- | 1.381 497 AU | not in source | [citation needed] |
Semi-major axis | 227,939,100 km | 3397+-4 | [citation needed] |
-"- | 1.523 679 AU | "1.523676824505276E+00" | [citation needed] |
Eccentricity | 0.093 315 | "9.331952575248627E-02" | [citation needed] |
Orbital period | 686.971 days | 686.98 d | [citation needed] |
-"- | 1.8808 Julian years | 1.88081578 y | [citation needed] |
-"- | 668.5991 sols | not in source | [citation needed] |
Synodic period | 779.96 days | not in source | [citation needed] |
-"- | 2.135 Julian years | not in source | [citation needed] |
Average orbital speed | 24.077 km/s | 24.1309 km/s | [citation needed] |
Mean anomaly | 19.3564° | "3.377586933117296E+01" | [citation needed] |
Inclination | 1.850° to ecliptic | "1.849069591375086E+00" | [citation needed] |
-"- | 5.65° to Sun's equator | not in source | [citation needed] |
-"- | 1.67° to invariable plane[2] | not in source (some digits lost) | [citation needed] |
Longitude of ascending node | 49.562° | "4.953665683803469E+01" | [citation needed] |
Argument of perihelion | 286.537° | "2.865833028032102E+02" | [citation needed] |
Satellites | 2 | not in source | [citation needed] |
Марсианский хро (talk) 12:24, 17 August 2011 (UTC)
For the citation "Scientists Discover Concealed Glaciers on Mars at Mid-Latitudes" I can go to WayBackMachine and manually plug in http://www.jsg.utexas.edu/news/rels/112008.html and choose the 20th of May 2011 to get the Jackson School of Geosciences article, but just clicking on the link does not work. Is my software out of date or is the link broken? Fartherred (talk) 16:05, 4 December 2011 (UTC)
When reading the content, it is unclear weather 'Timeline' refers to the Timeline of Mars missions or the history of the planet. — Preceding unsigned comment added by 109.125.105.149 (talk) 08:44, 8 December 2011 (UTC)
Well, the name of the article shouldn't be used in the section headings, so "Mars" can be removed. "Human" is assumed here, as Wikipedia is written by humans, for humans. That would reduced the list to "Timeline of missions" (or "Missions timeline"), "Timeline of exploration" (or "Exploration timeline"), or "Timeline of Exploration Missions". Regards, RJH (talk) 17:48, 20 January 2012 (UTC)
WE Johns in one of his "Biggles" stories wrote in fair depth about a trip to Mars, using the disc shaped space ship "Space master".AT Kunene (talk) 10:07, 14 February 2012 (UTC)
When reading the content, it is unclear weather 'Timeline' refers to the Timeline of Mars missions or the history of the planet. — Preceding unsigned comment added by 109.125.105.149 (talk) 08:44, 8 December 2011 (UTC)
Well, the name of the article shouldn't be used in the section headings, so "Mars" can be removed. "Human" is assumed here, as Wikipedia is written by humans, for humans. That would reduced the list to "Timeline of missions" (or "Missions timeline"), "Timeline of exploration" (or "Exploration timeline"), or "Timeline of Exploration Missions". Regards, RJH (talk) 17:48, 20 January 2012 (UTC)
WE Johns in one of his "Biggles" stories wrote in fair depth about a trip to Mars, using the disc shaped space ship "Space master".AT Kunene (talk) 10:07, 14 February 2012 (UTC)
There didn't seem to be a map of Mars with features being names in the article - and I stumbled accross this image which looked like it might be useful to the article. EdwardLane (talk) 11:37, 20 February 2012 (UTC)
This article states: "The first objects to successfully land on the surface were two Soviet probes: Mars 2[citation needed] on November 27 and Mars 3 on December 2, 1971, but both ceased communicating within seconds of landing." How were these successes? Sounds like they unsuccessfully landed as they failed within seconds. — Preceding unsigned comment added by 192.158.38.6 (talk) 14:12, 23 February 2012 (UTC)
Why is the synodic period given in Julian years, shouldn't this be in Gregorian years?AT Kunene (talk) 12:57, 4 March 2012 (UTC)
Under the section "Exploration missions", second paragraph, first sentence. "In the past" needs a comma after it. I know this is a bit trivial, but I had to spend a few moments figuring out what it meant and I figured I'd at least post this :)
"In the past dozens of spacecraft, including orbiters, landers, and rovers, have been sent to Mars..." to "In the past, dozens of spacecraft, including orbiters, landers, and rovers, have been sent to Mars..."
In the Orbit and Rotation section, paragraph two, Mars is described as having had its last perihelion and aphelion both occurring in March of 2010.
Reference 117 cites a source that lists: Apr 21, 2009: Mars in Perihelion (1.38134 AU, 206.6 million km) Mar 31, 2010: Mars in Aphelion (1.66594 AU, 249.2 million km). — Preceding unsigned comment added by 67.182.217.107 (talk) 17:58, 27 January 2012 (UTC)
Does Mars have chaotically unstable rotation? this is from the "Earth" article, under the Moon section: "Some theorists think that without this stabilization against the torques applied by the Sun and planets to the Earth's equatorial bulge, the rotational axis might be chaotically unstable, exhibiting chaotic changes over millions of years, as appears to be the case for Mars.[149]" If true, it seems like it should be added here. H870rce (talk) 12:23, 26 March 2012 (UTC)
Life on Mars Found by NASA's Viking Mission?, National Geographic, Ker Than, April 13, 2012.
' . . On Earth this clock is set to a 24-hour cycle, but on Mars it would be about 24.7 hours—the length of a Martian day.
'In his previous work, Miller noticed that the LR experiment's radiation measurements varied with the time of day on Mars.
'"If you look closely, you could see that the [radioactive-gas measurement] was going up during the day and coming down at night. ... The oscillations had a period of 24.66 hours just about on the nose," Miller said. . '
The image directly at the beginning of the article is cropped *exactly* at the circumference of the planet... this doesn't look great and is unlike images in all other articles about planets.
Could someone add a little bit of black around it? — Preceding unsigned comment added by 82.139.196.68 (talk) 00:59, 29 April 2012 (UTC)
You should mention in the article and Milutin Milanković. Sources Frozen Earth: The Once And Future Story of Ice Ages by Douglas Macdougall p.123 and [2]. Thanks.--Свифт (talk) 23:14, 11 May 2012 (UTC)
So, seeing some edits that got reverted earlier today, I don't think we should be describing hematite as "rust". I'm pretty sure rust is implicitly the product of oxidation of metallic iron, and it certainly is not only hematite - there's a bunch of other iron oxides in there too. In contrast, most of the martian hematite is either going to be primary, or at most the oxidation of existing oxides like magnetite. No metallic iron involved.
Just wanted to make sure no-one had any objections to this before I change it. I know it's appealing to be able to describe the surface of Mars as rusty, and I'll try to preserve something like that, but the way it's written it factually wrong. DanHobley (talk) 02:30, 15 May 2012 (UTC)
— Preceding unsigned comment added by Scooter20 (talk • contribs)
So many fine shots to choose from. This 1999 shot shows the polar cap, clouds, and Syrtis Major Planum. Shrug, I guess I don't care. It's the article text that matters. Regards, RJH (talk) 20:23, 17 June 2012 (UTC)
The figure for the equatorial radius is 3.396.2 km or 0.533 Earths. This is incorrect. The figure of 0.533 Earths applies to the Equatorial Diameter, not the radius otherwise its diameter would be larger than that of Earth. — Preceding unsigned comment added by Zooto68 (talk • contribs) 17:19, 14 July 2012 (UTC)
Pete Worden predicts settlement on Mars by 2060
Mention in article — Preceding unsigned comment added by 91.182.178.137 (talk) 14:17, 30 July 2012 (UTC)
In this section the text «In 2016, the Russian and ESA plan to send rover...» should be changed to «In 2016, the Russian Space Agency and ESA plan to send rover...». 217.67.177.50 (talk) 12:40, 3 August 2012 (UTC)
In light of the recent Curiosity landing, I came to this article looking for a discussion of Mars-Earth transmission times and couldn't find anything, so maybe someone more clueful than I can add it in. Also I couldn't find anything about the max distance between Mars and Earth (although I may have missed it). Thanks Manning (talk) 06:54, 6 August 2012 (UTC)
Funny that, we were attempting to do exactly the same thing, can the page be updated to include this information. We were attempting to calculate the response time of "curioisty" based on 2x tx delay plus any reaction time.Thanks. — Preceding unsigned comment added by 20.133.0.13 (talk) 09:09, 6 August 2012 (UTC)
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One of the photographs, commons:File:Mars face.png is an altered photograph. The photo has been run through a pair of filters that have reduced finer detail to the point where it has been lost entirely. In fact, Jet Propulsion Labs has documented this alteration at http://mpfwww.jpl.nasa.gov/mgs/target/CYD1/index.html.
In the interest of scientific objectivity, I believe an unaltered photo would be more appropriate, and more in line with your own journalistic integrity.
174.28.23.80 (talk) 19:09, 9 August 2012 (UTC)
Cite error: <ref> tag with name "Metnet" defined in <references> is not used in prior text; see the help page. Cite error: <ref> tag with name "metnet_mission" defined in <references> is not used in prior text; see the help page. Cite error: <ref> tag with name "bbc_rincon061110" defined in <references> is not used in prior text; see the help page. Cite error: <ref> tag with name "nasa_maven" defined in <references> is not used in prior text; see the help page. Cite error: <ref> tag with name "usra4" defined in <references> is not used in prior text; see the help page. Cite error: <ref> tag with name "usra3" defined in <references> is not used in prior text; see the help page. Cite error: <ref> tag with name "nasa6" defined in <references> is not used in prior text; see the help page. Cite error: <ref> tag with name "nasa5" defined in <references> is not used in prior text; see the help page. Cite error: <ref> tag with name "missionpg" defined in <references> is not used in prior text; see the help page. Cite error: <ref> tag with name "day" defined in <references> is not used in prior text; see the help page. Cite error: <ref> tag with name "autogenerated1" defined in <references> is not used in prior text; see the help page. Cite error: <ref> tag with name "archive" defined in <references> is not used in prior text; see the help page. Cite error: <ref> tag with name "airspacemag" defined in <references> is not used in prior text; see the help page. — Preceding unsigned comment added by Kenorb (talk • contribs) 12:42, 10 August 2012 (UTC)
Please update highest temperature on Mars. While the conservative figures quoted are from Nasa, there are other Nasa sites especialy rover site which quotes much higher numbers. Would somebody please further research and update. A quote from nasa rover source at : http://marsrover.nasa.gov/spotlight/20070612.html
Quoteing:
During their exploration of Mars, the rovers have recorded temperatures ranging from midday highs of about 35 degrees C. (95 degrees F.) in spring and summer to nighttime lows of about minus 110 degrees C. (minus 166 degrees F.) in winter. Spirit has experienced greater temperature swings because its location is farther from the martian equator, where sunlight is seasonally either more direct or less direct than at Opportunity's location. — Preceding unsigned comment added by 109.227.11.180 (talk) 20:56, 25 June 2012 (UTC)
Summer temperatures in the Southern hemisphere are either 30 degrees Celsius warmer and 54 degrees Fahrenheit warmer than the equivalent summer temperatures in the north or they're 86 degrees Fahrenheit warmer and 48 degrees Celsius warmer than the equivalent summer temperatures in the north. Obviously, 30 degrees Celsius warmer can't equal 86 degrees Fahrenheit warmer as is wrongly claimed in the article. I can't access the MIT reference to check up myself which is correct, the Fahrenheit or Celsius value. — Preceding unsigned comment added by 86.182.210.149 (talk) 22:35, 13 August 2012 (UTC)
JorisvS changed Mars' to Mars's. This sort of thing was discussed in Talk:Mars/Archive 8#The possessive case of Mars both forms are used and the English language itself does not define the rules for possessive case spelling absolutely in this situation. Let us not get into establishing grammar for the language. I prefer WolfmanSF's spelling but would be satisfied to leave it as it is spelt. - Fartherred (talk) 19:30, 18 September 2012 (UTC)
Croatian writer Giancarlo Kravar: Water on Mars! Discovered by NASA rover Curiosity. After a seven-week mission to Mars, Curiosity sent photos that reliably prove that on the planet used to bring water. Scientists estimate that the Curiosity even discovered a network of ancient riverbeds. Croatian daily Večernji list published a photo showing that the Martian surface once the river flowed.78.2.86.100 (talk) 03:12, 30 September 2012 (UTC)
what is the company name of mars? — Preceding unsigned comment added by 108.249.142.62 (talk) 22:15, 12 October 2012 (UTC)
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Mars was created by penguins in the early 1940s because of all the Eskimo raptors that hunted them. Too many penguin were dying because of the Eskimo raptors that the realized there has to be someplace new and safer. The penguins did what they could to fight off the Eskimo raptors while they thought of how to solve their problems. Many penguins were dying but the remaining survivors built a rocket made out of ice footballs. Barren2134 (talk) 05:35, 18 October 2012 (UTC)
All the atmospheric pressure data in the atmosphere section is given in kPA. Since this is an encyclopedia, we need English measurements so that it is meaningful and comprehensible to the layman. Someone needs to convert these pressures into PSI, ditto for the thicknesses of the ice sheets (need to be converted to feet/yards.) and add the standard customary figures to the metric ones.198.229.211.94 (talk) 04:38, 29 October 2012 (UTC)
This sentence has been around for a long time: "The summer temperatures in the south can reach up to 30 °C (54.0 °F) warmer than the equivalent summer temperatures in the north". I have tried to edit it but my edits are rejected. To be clear, 30 Celsius is 86 F. Not 54. The 54 is a typo. — Preceding unsigned comment added by Marleymanbob (talk • contribs) 16:48, 02 November 2012 (UTC)
The summer temperatures in the south can reach up to 30 °C (54.0 °F) warmer than the equivalent summer temperatures in the north.[134]
30°C is 86°F and 54°F is 12.2°C. I would guess that the 12.2°C/54°F is the correct value, but I cannot access the article referenced in the foot note Smoidel (talk) 16:32, 4 November 2012 (UTC) S Moidel 11-4-12
Nevermind, just found it. sorry. --RacerX11 Talk to meStalk me 17:54, 4 November 2012 (UTC)
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This fails to mention the hydrogen in the Martian interior. The December 1, 2012 issue of Earth and Planetary Science Letters will publish the finding of scientists Conel Alexander and Jianhua Wang, who studied Martian metorites. It is important that the Wiki page on the internal structure of Mars reflect that Earth and Mars formed from similar sources and that they have chondritic meteorites as their sources of water. — Preceding unsigned comment added by 35.0.87.254 (talk • contribs) 4 December 2012
The term "Martian" is (correctly) capitalized in most locations in the article, but the incorrect version "martian" appears. Please fix, thank you.
im the bestt n plutoo future — Preceding unsigned comment added by 169.139.112.126 (talk) 17:18, 19 December 2012 (UTC)
The ref with this url has a dead lnk: http://mpfwww.jpl.nasa.gov/mgs/newsroom/20050920a.html -- FutureTrillionaire (talk) 05:35, 8 January 2013 (UTC)
Nope. NO mention. I guess you could visit the Grand Canyon and rewrite his book about wasting time in the shower.
Though shovels are good better for dredging. — Preceding unsigned comment added by Garinwm (talk • contribs) 00:26, 1 August 2013 (UTC)
The title: Is Mars Habitable? Good details in our article on Wallace. --96.233.82.149 (talk) 08:04, 12 March 2013 (UTC)
The main article, under the volcanoes section, says that Olympus Mons is the second highest volcano in the solar system, but the accompanying photograph has a caption saying it is the highest. Can we get a definitive clarification? Dezaxa (talk) 22:57, 15 April 2013 (UTC)
If I'm not mistaken, Mars' moons have to do with Heaven's Family tree. Athena should be one of them. His son's names are Phobos and Deimos. Anyone knows the Mars moon Myth? Mars moon is a special kind of moon. It glows dim at night. — Preceding unsigned comment added by Garinwm (talk • contribs) 00:28, 1 August 2013 (UTC)
All the other planets use true images be they composites of fly-bys or full images from the Hubble Space Telescope etc. Why should Mars be any different?
A true image is most definitely preferable to a computer generated image. That it is higher resolution is irrelevant is it is not a true image anyway. The current CGI image does not look good as part of the header and should be in the gallery sectionBaronVonchesto (talk) 04:46, 4 September 2013 (UTC)
Swedish links to Universe, that's the wrong article. Can somebody remove it? — Preceding unsigned comment added by 178.107.47.187 (talk) 04:02, 9 October 2013 (UTC)
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Iamjppunzalan (talk) 12:29, 10 January 2014 (UTC)
The distance between the earth and mars is not anywhere in the article. I think this information is very important for it to be omitted whatsoever. — Preceding unsigned comment added by Aleksandrvladimirov (talk • contribs) 22:38, 11 January 2014 (UTC)
182.186.18.13 (talk) 13:41, 17 February 2014 (UTC)
This image should be free, and is amazing. Tell me if you want it uploaded so that it can be added to the article. [4], source here states NASA image:[5] CFCF (talk · contribs · email) 10:47, 20 February 2014 (UTC)
Is there any possible way we can get this beautiful shot taken by Rosetta as the image in the infobox? Since it's not a NASA image, I'm not exactly sure of it's copyright, although it would make a fine replacement of the fugly mosaic, that really looks unrealistic perspective-wise, that currently takes the role. RazorEye ⡭ ₪ ·o' ⍦ ࿂ 09:05, 31 March 2014 (UTC)
The article wrongly states that Marvin the Martian made his first appearance on television. He was in a short film shown in theaters before and between movies. Why is this article protected, anyway? — Preceding unsigned comment added by 162.232.246.7 (talk) 03:38, 8 April 2014 (UTC)
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Please provide a short description and link to Mars-one mission page already present on wikipedia [source :http://www.mars-one.com ; https://en.wikipedia.org/wiki/Mars_One] Kg.iitb (talk) 16:09, 8 May 2014 (UTC)
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1. Please add "5.1 Mars-One mission" in content between "5.Exploration Missions and 6. Astronomy on Mars" 2. Please add "Mars One is a not-for-profit foundation that was founded by Bas Lansdorp & Arno Wielders (both from Netherlands) and that aims to establish a permanent human settlement on Mars. Mars One will select and train the human crew for permanent settlement. Departure of crew will start from year 2024" in 5.1 Mars-One mission Kg.iitb (talk) 15:12, 9 May 2014 (UTC)
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1. Please add "5.1 Mars-One mission" in content between "5.Exploration Missions and 6. Astronomy on Mars" 2. Please add "Mars One is a not-for-profit foundation that was founded by Bas Lansdorp & Arno Wielders (both from Netherlands) and that aims to establish a permanent human settlement on Mars. Mars One will select and train the human crew for permanent settlement. Departure of crew will start from year 2024" in 5.1 Mars-One mission [source http://www.mars-one.com/] Kg.iitb (talk) 02:45, 10 May 2014 (UTC)
Regarding the above edit requests, it seems the Mars One has plenty of sources establishing notability. Now the question is, what, if anything, should be addeded about Mars One to this featured article? --NeilN talk to me 04:26, 10 May 2014 (UTC)
Mars will be the closest to Earth tonight. Expect more coverage.
Headine-1: Look up! Mars expected to light up night sky
QUOTE: “'The planet is expected to line up with Earth and the Sun. It happens every two years. You should be able to get a good look tonight.'” [The WP article herein has a great graphic on planet revolutions.] — Charles Edwin Shipp (talk) 23:46, 8 April 2014 (UTC)
Headine-2: Watch Mars Invade Our Sky: Biggest and Brightest Since 2007
QUOTE: “While this occurs every 26 months, this year’s event creates the perfect cosmic alignment to have Mars shine its biggest and brightest in the evening sky in nearly seven years.” [Take your home telescope outside tonight and watch the east.] — Charles Edwin Shipp (talk) 23:49, 8 April 2014 (UTC)
Headine-3: The Night of the Red Planet
QUOTE: “Mars, the red planet, will be at opposition on 8 April 2014. That very same night, we will explore that inspiring and amazing world thanks to the Virtual Telescope, sharing its images online, in real-time.
Live commentary by Dr. Gianluca Masi, astrophysicist.” [These people broadcast for those without telescopes.] — Charles Edwin Shipp (talk) 23:52, 8 April 2014 (UTC)
Yes, something can go in the Mars article here for a seven-year event. I'm a new visitor here, so I'm putting all the news here for more regular editors here to evaluate, now or later. Also, in case you are really interested, watch the eastern horizon this evening, (about now on the West Coast.) — Charles Edwin Shipp (talk) 01:32, 9 April 2014 (UTC)
Headine-4: Awesome alignment: Mars, Earth, sun to line up (video)
QUOTE: “This means Mars rises near sunset and remains visible all night long as it moves nearly overhead across the night sky. It will be a bright burnt orange color, NASA's Mars Exploration Program reports, and almost 10 times brighter than the brightest stars in the sky.” [Hope you can watch it.] — Charles Edwin Shipp (talk) 01:34, 9 April 2014 (UTC)
Headine-5: Close Mars, Lunar Eclipse And Lyrid Meteors - April 2014 Skywatching Video
QUOTE: “Red Mars' close encounter with Earth, a 'red moon' total lunar eclipse (visible from North America) and the Lyrid meteor shower will highlight the month of April 2014. Also, the mornings and evenings will showcase Jupiter, Saturn and Venus. Credit: Space Telescope Science Institute, Office of Public Outreach” [The 'Mars' article here in Wikipedia has a 'video' section at the bottom. How current is it? How important are the entires?] — Charles Edwin Shipp (talk) 11:42, 9 April 2014 (UTC)
Headine-6: Astronomical Events 2014: Watch the ‘Biggest’ and the ‘Brightest’ Mars on April 8 and April 14; When and Where to View it Live
QUOTE: “On April 14, 2014, Mars and Earth will come close. Sky gazers can enjoy the night by witnessing two celestial events. On this night, Mars can be viewed its "biggest in more than six years." But the event concurs with the rare celestial event, the total lunar eclipse. Moon and Mars will be "blazing red in the night sky," as described by the Web site. ” — Charles Edwin Shipp (talk) 11:52, 9 April 2014 (UTC)
NOTE: The quotes added here in TALK are to improve the article, now or later in the year, especially with new video and discovery. — Charles Edwin Shipp (talk) 14:49, 15 April 2014 (UTC)
That's why I am putting this information here in TALK. I'm move over to Mars Rover. Charles Edwin Shipp (talk) 15:11, 10 May 2014 (UTC)
I have deleted the following as unneeded and unencyclopedic: An email sent during the close approach in 2003 has, in succeeding years, repeatedly spawned hoax emails saying that Mars will look as big as the Moon. Jusdafax 22:52, 21 June 2014 (UTC)
I'm creating a page on the orbit of Mars. The perihelion and aphelion distances are 1.3814 and 1.6660 au, agreeing on a solex table of distances, VSOP87 elements, the 250 year best fit by E. Myles Standish, and F. E. Ross from at least a century ago. But Wikipedia doesn't agree with either in the last digit. Saros136 (talk) 04:03, 25 July 2014 (UTC)
Saros136 (talk) 16:38, 26 July 2014 (UTC)
Pluto has been officially re-declared a planet. It is now, once again, the 3rd smallest planet. — Preceding unsigned comment added by 206.72.2.204 (talk) 00:36, 28 October 2014 (UTC)
NASA-TV/ustream (Friday, November 7, 2014@12pm/et/usa) - experts provide initial science observations of comet C/2013 A1 close flyby of Mars on October 19, 2014 and the Martian atmosphere.[1] - Enjoy! :) Drbogdan (talk) 03:26, 6 November 2014 (UTC)
References
Under the Habitability section there is the phrase "Microorganisms make up 80% of Earth's biomass." This is irrelevant and does not relate to Mars. 24.149.255.225 (talk) 21:47, 30 November 2014 (UTC) Anonymous
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[1] Thoefen (talk) 07:02, 3 December 2014 (UTC)
References
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This is the section that I discovered:
Mars is a terrestrial planet that consists of minerals containing silicon and oxygen, metals, and other elements that typically make up rock. The surface of Mars is primarily composed of tholeiitic basalt,[1] although parts are more silica-rich than typical basalt and may be similar to andesitic rocks on Earth or silica glass. Regions of low albedo show concentrations of plagioclase feldspar, with northern low albedo regions displaying higher than normal concentrations of sheet silicates and high-silicon glass. Parts of the southern highlands include detectable amounts of high-calcium pyroxenes. Localized concentrations of hematite and olivine have also been found.[2] Much of the surface is deeply covered by finely grained iron(III) oxide dust.[3][4]
The reference to the discovery of olivine should be my Science paper:
[5] Thoefen (talk) 07:00, 3 December 2014 (UTC)
References
sci300a
was invoked but never defined (see the help page).sci300b
was invoked but never defined (see the help page).Under 7. Views - Closest approaches is says:
"The last Mars opposition occurred on April 8, 2014 at a distance of about 180 million km." ref[194]
According to reference [194] the distance is 0.621 AU which equals about 93 million km not 180.
Pls. correct. to "93 million Km." — Preceding unsigned comment added by 95.180.215.122 (talk) 13:13, 6 December 2014 (UTC)
Ouch, one of our Orbital dynamics Jedi stepped into that one on 14 June 2014. -- Kheider (talk) 17:12, 24 January 2015 (UTC)
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I wanted to request to make a slight change in tone regarding how frequently pressure and temperature conditions allow for liquid water on Mars.
The landers since viking routinely (meaning on a daily basis) measure pressures above 800 Pascal, and temperatures above the freezing point of water. The article as written implies that this only happens rarely.
The triple point of water is at a pressure of about 611 Pascals. Over a 100 sol period in 2008, the Phoenix lander recorded an average pressure of about 857 Pa. In 1976, the Viking lander recorded pressures over 700 Pa. The Curiosity probe which landed in 2012 often measures pressures as high as 1000 Pa with temperatures above 0C at the same time.
In fact, in most places where probes have landed, the pressure is consistently above the triple point. For example, Phoenix typically measures pressure above 800 Pa, and the most recent rover, Curiosity (MSL) routinely measures pressures between 700 and 1000 Pa. Thus, liquid water is possible whenever the temperature crosses 0 Celcius, which occurs on a daily basis during Spring and Summer days.
Now, I know this type of edit must be done carefully to avoid creating a tone that implies that liquid water is abundant.
For example the section on hydrology opens with:
"Liquid water cannot exist on the surface of Mars due to low atmospheric pressure, which is about 100 times thinner than Earth's,[61] except at the lowest elevations for short periods."
Perhaps a better way to start this section might be:
"Liquid water can exist on the surface of Mars. The triple point of water is 611 Pa, and the pressure on Mars is frequently above this, especially at lower elevations. However, Mars is very dry, so even when pressure and temperatures allow for liquid water, it is rarely present..."
This is a subtle point that I think should be addressed...
The lander data from JPL...[1] confirms that liquid water can occur frequently.
TomEdBrennan (talk) 18:34, 18 January 2015 (UTC)
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template. B ECKY SAY L ES 17:16, 19 January 2015 (UTC)Here are several recent published articles that claim that liquid water occurs on Mars. Mostly based on orbital photography of frequent changes in water-flow gullies:
Cite error: A<ref>
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template. That's not an on-wiki discussion that has achieved a consensus to implement your requested changes. Please do what we've asked instead. :) — {{U|Technical 13}} (e • t • c)
17:38, 24 January 2015 (UTC)References
@inproceedings{mcewen2012recurring, title={Recurring Slope Lineae: Evidence for Present-Day Flowing Water on Mars?}, author={McEwen, A and Byrne, S and Dundas, C and Mattson, S and Murchie, S and Ojha, L and Schaefer, E and Thomas, N and Wray, J}, booktitle={European Planetary Science Congress 2012}, volume={1}, pages={276}, year={2012} }</body></html>
@article{hecht2002metastability, title={Metastability of liquid water on Mars}, author={Hecht, Michael H}, journal={Icarus}, volume={156}, number={2}, pages={373--386}, year={2002}, publisher={Elsevier} }</body></html>
@article{haberle2001possibility, title={On the possibility of liquid water on present-day Mars}, author={Haberle, Robert M and McKay, Christopher P and Schaeffer, James and Cabrol, Nathalie A and Grin, Edmon A and Zent, Aaron P and Quinn, Richard}, journal={Journal of Geophysical Research: Planets (1991--2012)}, volume={106}, number={E10}, pages={23317--23326}, year={2001}, publisher={Wiley Online Library} }</body></html>
@article{mcewen2007closer, title={A closer look at water-related geologic activity on Mars}, author={McEwen, AS and Hansen, CJ and Delamere, WA and Eliason, EM and Herkenhoff, KE and Keszthelyi, L and Gulick, VC and Kirk, RL and Mellon, MT and Grant, JA and others}, journal={Science}, volume={317}, number={5845}, pages={1706--1709}, year={2007}, publisher={American Association for the Advancement of Science} }</body></html>
@article{mellon2001recent, title={Recent gullies on Mars and the source of liquid water}, author={Mellon, Michael T and Phillips, Roger J}, journal={Journal of Geophysical Research: Planets (1991--2012)}, volume={106}, number={E10}, pages={23165--23179}, year={2001}, publisher={Wiley Online Library} }</body></html>
@article{dickson2015recent, title={Recent climate cycles on Mars: Stratigraphic relationships between multiple generations of gullies and the latitude dependent mantle}, author={Dickson, James L and Head, James W and Goudge, Timothy A and Barbieri, Lindsay}, journal={Icarus}, year={2015}, publisher={Elsevier} }</body></html>
if anyone wants to use the ROSETTA Mars image...
Go upload it yourself.
Also make sure it has sufficient copyright. — Preceding unsigned comment added by TheWhistleGag (talk • contribs) 02:04, 24 February 2015 (UTC)
Comparison: Different Views of Mars (from top left):
Okay, this section is long overdue. Looks like we have three candidates for lead image: a composite from MGS data, an image from the Rosetta flyby, and an image from Hubble (all pictured at right). Let's all say which one we prefer and give our reasoning to try to reach a consensus on this.
For me, the most important criterion that planet lead images should be judged by is likeness to life. I believe that the average Wikipedia reader expects the lead image to depict the planet as it would actually appear and that to show it any other way would be misleading. For this reason, I object to using the MGS composite as the lead image. It is by far the most detailed, but it bears little resemblance to what Mars actually looks like from the perspective shown in the image. Essentially, it is a creative way to display images taken from low orbit, from which perspective the surface looks very different than from the distant perspective artificially shown in the composite image. Look around the edges, especially in the polar regions, and you can see very clear artifacts from the wrapping of flat, low-altitude images onto a sphere. It would be fine to use this image elsewhere in the article, but I think the lead should show the planet as it actually appears.
In accordance with "likeness to life", my first choice is the Rosetta flyby image, a single capture from a spacecraft in the vicinity of Mars. I strongly prefer that the image be used as it was originally posted, without the "enhanced" color processing, which makes the picture look prettier but less true-color and thus less accurate. The ESA website has the "enhanced" color image labeled as true-color, so I stand corrected. I understand that this image also has potential copyright issues, and I of course do not support it if those are not resolved.
My second choice is the Hubble image. As a telescopic image, it is not as preferable as one actually taken in the vicinity of Mars, but it is still truer to life than the MGS composite. If the color of the Rosetta image is not changed back to the original or if the copyright issues prove unresolvable, this is my first choice. A2soup (talk) 19:52, 22 February 2015 (UTC)
Yes - the new "Hubble2 image" seems *entirely* ok with me as well - seems to be a higher resolution than the "Hubble1 image" (over three times? => 1600x1600/"Hubble2 image" vs 500x500/"Hubble1 image") and nearly the same resolution (only 1/3 less?) of the "MGS image" (at 2400x2400) - also - the "Hubble2 image" seems very popular on Wikipedia (see global usage) - the "Hubble2 image" seems an *excellent* replacement for the "present MGS image" imo - in any case - Enjoy! :) Drbogdan (talk) 13:46, 24 February 2015 (UTC)
FWIW - a possible "compromise" suggestion *might* be the newly created multiple four-images presentation (or some variant of course) posted above - In any case - Enjoy! :) Drbogdan (talk) 18:57, 24 February 2015 (UTC)
But why does the Hubble2 image look unsharp—look especially at the south polar region? And why does it end so abruptly at the edges, as if the pixels are not area-averaged of what's actually there? --JorisvS (talk) 09:18, 25 February 2015 (UTC)
ADDED NEW MARS IMAGES => added new "Voyager 1 Orbiter - (1980)" images above for possible consideration as follows => File:PlanetMars-VallesMarineris-VikingOrbiter-1980.jpg - and - File:PlanetMars-SyrtisMajor-VikingOrbiter-1980.jpg - may have ok resolution (and ok colors? & related) - Enjoy! :) Drbogdan (talk) 15:24, 25 February 2015 (UTC)
FWIW - Sent an EMail to ESA re the "Rosetta Mars" image as follows:
From: "Dr. Dennis Bogdan" <drbogdan at comcast.net>
To: spaceinimages at esa.int, media at esa.int, scitech.editorial at esa.int
Cc: joannebogdan at yahoo.com, drbogdan at comcast.net
Date: Thu, 26 Feb 2015 17:23:29 -0500
Subject: QUESTION: Can Copyright Permission Be Granted To Wikipedia To Use A Particular ESA MARS Image In The MARS Wikipedia Article?
QUESTION: Is there any possible way to obtain the copyright permission needed for Wikipedia to use a favored ESA Rosetta spacecraft (OSIRIS?) image of the planet MARS in the MARS Wikipedia article?DETAILS: On behalf of several Wikipedia editors, we would like to use a particular ESA image ( please see => http://www.esa.int/spaceinimages/Images/2007/02/True-colour_image_of_Mars_seen_by_OSIRIS ) of the planet MARS in the MARS Wikipedia article ( at the following => https://en.wikipedia.org/wiki/Mars ) - this particular MARS image ( of several NASA images considered ) ( please see => https://en.wikipedia.org/wiki/Talk:Mars#Lead_image ) is currently favored by Wikipedia editors. Seems we would require copyright permission from ESA that may be compatible with Wikipedia copyright requirements ( please see => https://en.wikipedia.org/wiki/Wikipedia:FAQ/Copyright ).
Thanking you in advance for your reply,
Dr. Dennis Bogdan
--
| Dr Dennis Bogdan * Computer DataPro Consulting
| drbogdan at comcast.net * drbogdan at yahoo.com
| http://en.wikipedia.org/wiki/User:Drbogdan
| http://www.facebook.com/drbogdan
| http://home.comcast.net/~drbogdan/publications.html
--
May (or may not) receive an answer - but at least an effort was made - Enjoy! :) Drbogdan (talk) 22:46, 26 February 2015 (UTC)
According to research Mars planet had more water than The Earth's Arctic ocean. NASA scientist are wondering why this much water left the planet. Details have been explained here:
http://phys.org/news/2015-03-mars-earth-arctic-ocean.html
-- Mansour JE MansourJE (talk) 07:36, 6 March 2015 (UTC)
This is protected so I can't edit it myself. Why is there stuff like "1,155 Pa (1.155 kPa)" in several places in the article? This is insulting the reader's intelligence. Having miles and kilometers makes sense, but Pa and kPa is absolutely ridiculous. Do we write "100 meters (0.1 kilometers)" everywhere on Wikipedia? No, we don't. — Preceding unsigned comment added by 93.136.60.110 (talk) 22:24, 2 April 2015 (UTC)
Just thought I'd post a few notes about this article based upon what an ordinary guy might think. I know an article like this can't be dumbed down to a six grader's level, but some things should be more accessible for the non-technical reader.
In the Lede:1) One thing I would include is the closest distance from Earth as I'm sure that is one of the things people specifically come here to find out; 2) Is it possible to put the equator on the lede photo? Most people who look at it will assume that the equator is right in the middle (along with the Prime Meridian) and not realize that the planet is tilted; 3) I also think it should be noted that the planet is called Mars because the planet is red, which reminded the ancients of blood, which is why the named it after the God of War; 4) As for the point about Olympus Mons, when you state something is the second highest, it instantly raises the question (it does not "beg the question"): what's the highest? (Also, how deep is the lowest point?) 5) While I realize it's customary to give distances using the metric system, would it be out of place to give the Imperial measurements also?
Surface geology: shouldn't "Mya" be defined when first used?
Hydrology: Currently, there is this sentence:『The volume of water ice in the south polar ice cap, if melted, would be sufficient to cover the entire planetary surface to a depth of 11 meters (36 ft)』How is that possible? Does that mean if you stood atop of Olympus Mons you would still be under water? How tall is the ice cap?
Volcanoes: it wouldn't hurt to note the location of Olympus Mons on the small map.
In culture: 1) If you don't put the reason for Mars' name in the lede, then put it here. 2) The paragraph that begins with "Early in December 1900," appears to be a block quote, but because of the placement of the illustration it looks just like another paragraph. Either the picure should be moved or the use of the large quotation marks used to make this clear.
Astronomy on Mars: The caption under the photo reads, "Comet Siding Spring to pass near Mars on October 19, 2014" Can somebody change that to past tense?
And can we get rid of the goofy use of BCE and CE? Shouldn't science be above political correctness? __209.179.1.55 (talk) 01:59, 3 April 2015 (UTC)
"Atmosphere Scale Height" Earth's atmosphere is closer to 8km than 6km. Also, Mars dust is notably homogenous in the atmosphere with a similar scale height to the gaseous part. — Preceding unsigned comment added by 174.16.78.218 (talk) 00:32, 5 May 2015 (UTC)
Please remove the mean anomaly. Mean anomaly changes constantly. It is unhelpful (and incorrect) to list a static value. — Preceding unsigned comment added by 140.32.16.3 (talk) 14:26, 5 May 2015 (UTC)
The gravity of mars is defined as the same as mercury. How is it defined for mercury, the same as mars? That's not a definition — Preceding unsigned comment added by 2602:302:D8C:D9:8CC3:4044:7010:FA37 (talk) 18:49, 6 July 2015 (UTC)
NASA-TV/ustream (Monday, September 28, 2015@11:30am/et/usa) - NASA will detail a "Major Science Finding" about the planet Mars[1] - Enjoy! :) Drbogdan (talk) 00:52, 25 September 2015 (UTC)
References
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change ((salt water)) to ((Saline water|salt water))
MansourJE (talk) 03:06, 23 December 2015 (UTC)
Hi, I recently uploaded https://commons.wikimedia.org/wiki/File:The_complex_caldera_of_Olympus_Mons_on_Mars.jpg and suggest to add it to the volcanoes section ... let me know what you think. Thanks! Mtrova (talk) 17:57, 11 February 2016 (UTC)
NASA Briefings/livestream – Experts to discuss the latest Ceres, Mars, Pluto results (near Houston, TX; March 21 – 22, 2016)[1] - Enjoy! :) Drbogdan (talk) 12:30, 17 March 2016 (UTC)
References
Can someone please create an interwiki link to https://mg.wikipedia.org/wiki/Marsa — Preceding unsigned comment added by 2601:14B:8000:8D63:223:69FF:FE00:2E1C (talk) 00:05, 20 March 2016 (UTC)
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Please change the current text about Olympus Mons, as it is THE largest known mountain in the solar system, not the second largest.— Preceding unsigned comment added by Kaishaku 1986 (talk • contribs)
For the infobox if interested: http://hubblesite.org/newscenter/archive/releases/2016/15/ CuriousMind01 (talk) 12:53, 21 May 2016 (UTC)
The article contains the following assertion:
However, I didn't see that mentioned in the attached reference. Part of the problem may be that we don't have full access to the reference work, but the part that was visible didn't seem to mention the possibility. It might help if this statement was backed up by a scholarly study. Praemonitus (talk) 20:43, 27 May 2016 (UTC)
Should the third paragraph of the "Surface geology" section cover the Grand tack hypothesis and its likely impact on the accretion of material that formed Mars? Praemonitus (talk) 19:46, 10 June 2016 (UTC)
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The images from the following links should be added to the photos in the "Mars" Article: http://imgur.com/vCubgyA http://imgur.com/KVAnI5S Blinndsay (talk) 22:59, 29 June 2016 (UTC)
The Density of Mars can be described as an equation of the Form A R^3 + B R + C where R is the Radius in Kilometers, and C is the Density of the Crust, while A is the tri-axial coefficient of compression, and B is the gravitational uni-axial co-efficient of compression. R is the Radius at the tilt angle of a spinning sphere ( approximately 23 degrees 19 minutes and 39.3 seconds of tilt = 23.327 583 333 degrees of tilt. The tilt angle radius gives a slightly better indication of the Volume of an oblate spheroidal planet like Mars, where the Equitorial Radius is greater than the Polar radius. The Tilt Angle Radius = (( 1 X polar Radius) + ( 2.858 093 602 X Equitorial Radius )) / 3.858 093 602. This gives 3391.0161 Km. The density is then ( 1 + Pi ) X 10^-9 X R^3 + ( 1 + SQRT 2) X 10^-1 X R + 2941.05 kg/m^3. This gives 161.4942016 + 818.663704 + 2941.05 = 3921.207906 kg/m^3. This is slightly lower density than density listed in the article of 3933.5 +/- 0.4 kg/m^3, but the Radius is slightly higher, and Mass will be 6.404 688 781 E23 is slightly lower, and the surface gravity is slightly higher at 3.71743 m/sec^2 versus 3.711 m/sec^2. The advantage of the density equation is that it gives a density for the dominate materials that make up the Crust of Mars. That is 2941.05 Kg/m^3 and other materials mixed together still are dominated by the Unit mass of the tholeiitic basalt. In comparison Venus has a Value of C = 2657.05 ( granite and Diorite ), and the Earth and Moon have a value of C = 2900 Kg/m^3 ( >85 % Basalt, and <15 % Granite by volume in the Crust ). The Density Equation is for Rocky Planets, so it doesn't work well on Mercury, or the Gas Giant Planets. In addition it can be used on the ice Planets, but the value of C can be lower than 1000. In conclusion the Rocky Planet Density Equation can be used to determine the density of the crustal materials as well as the overall average density of the Planet, or Satellite of a Planet.63.225.17.34 (talk) 17:11, 3 July 2016 (UTC)
I feel Moons comes in such an insignificant part of the page. I'm thinking it is worth moving closer to the top of the page. Would it perhaps belong in the Physical Characteristics? Situphobos (talk) 09:41, 8 July 2016 (UTC)
My understanding was that orbital parameters don't need to be kept highly precise because (1) orbits change due to perturbation, and (2) this is an encyclopedia, not a NASA tracking station. I attempted to rectify this by reverting the editsofW like wiki, but this was reverted without a suitable explanation. It looks like this user has done the same to the other planet wikipages. Praemonitus (talk) 17:39, 4 August 2016 (UTC)
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— 2601:183:4000:D57A:E532:F558:2BA1:2602 (talk) 01:33, 12 August 2016 (UTC)
The Mars and remaining solar system body infoboxes should include H, the absolute magnitude. Urhixidur (talk) 13:18, 28 August 2016 (UTC)
One source of H values is this one (IMCCE). Urhixidur (talk) 15:01, 28 August 2016 (UTC)
"Mars's cycle of eccentricity is 96,000 Earth years compared to Earth's cycle of 100,000 years.[176] Mars has a much longer cycle of eccentricity with a period of 2.2 million Earth years, and this overshadows the 96,000-year cycle in the eccentricity graphs." Not all of these numbers can be correct. My guess is that the period for the precession of the equinoxes is 2.2 million years (one would expect it to be longer than that of Earth because of the lack of a large moon for Mars) and the 96,000 is for the eccentricity. — Preceding unsigned comment added by 79.255.49.141 (talk) 10:31, 29 September 2016 (UTC)
European Space Agency's Schiaparelli "landed" on Mars on 2016.10.19. Articles from just before the event include http://www.bbc.co.uk/search?q=European%20Space%20Agency%27s%20Schiaparelli and http://www.npr.org/sections/thetwo-way/2016/10/19/498523167/watch-european-probe-will-attempt-to-land-on-mars as well as more recently http://www.telegraph.co.uk/science/2016/10/19/exomars-space-probe-schiaparelli-landing-mars-surface-live/ Kdammers (talk) 19:50, 19 October 2016 (UTC)
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The opening statement in the "Hydrology" section is syntactically incorrect. It currently reads : "Liquid water cannot exist on the surface of Mars due to low atmospheric pressure, which is less than 100 times that of Earth's,". This is technically saying the pressure is less than Earth's pressure times 100. What it should be saying is that pressure on Mars is less than 1/100th of Earth, or perhaps pressure is less than 1% of Earth's.
This is more easily seen if you replace phase "less than" with "about". If you were to say "..., which is about 100 times that of Earth's" the flaw is easily visible.
172.4.0.225 (talk) 22:58, 19 October 2016 (UTC)
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Please substitute the link in reference 34 to this one: http://www.nature.com/news/2004/040503/full/news040503-6.html because the current one is dead. IlnarSelimcan (talk) 06:13, 8 February 2017 (UTC)
The caption of one of the images says that, but I can't see any lander on it. Maybe the "place where Spirit has landed" or similar was meant instead? — Preceding unsigned comment added by IlnarSelimcan (talk • contribs) 20:44, 22 April 2017 (UTC)
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Change "Argument of perihelion" from "286.502" to "336.04084", as per the NASA Space Science Data Coordinated Archive (https://nssdc.gsfc.nasa.gov/planetary/factsheet/marsfact.html), last updated 23th december 2016 and the book Solar System Dynamics, 1999, Murray, C. D. and Dermott, S. F.. 118.211.13.248 (talk) 01:58, 1 May 2017 (UTC)
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Reference 24 doesn't say anything about atmospheric pressure on Mars being "6/1000 of Earth's". Someone with edit rights, please do something about it! IlnarSelimcan (talk) 20:25, 22 July 2017 (UTC)
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In the second paragraph it states: "The rotational period and seasonal cycles of Mars are likewise similar to those of Earth, as is the tilt that produces the seasons." In fact, it is not Mars' tilt that is primarily responsible for creating its seasons. Rather, it's the eccentricity of its orbit (the fact that it moves closer and further from the sun at various times throughout its year) that is primarily responsible for producing its seasons. I might change the current sentence to: "The rotational period and seasonal cycles of Mars are likewise similar to those of Earth. Though its rotational axis is tilted with respect to its orbital plane a similar amount as Earth's, unlike Earth its seasons are primarily caused by its elliptical orbit." Chopachula (talk) 19:01, 26 July 2017 (UTC)
The 47-year cycle of Mars: after 47 years - 22 synodic periods of 780 days each - Mars returns to the same position among the stars and is in the same relationship to the Earth and Sun. The ancient Mesopotamians discovered this cycle. [10]
Hello, It is commonly known that evidence of seasonal waterflow or active waterflow was found on Mars near the Curiosity[1], but the curiosity is not allowed to look[2]. Please try to edit this in to the article. Thank you.
References
Much higher concentration of silica element at some sites over the past last seven months than anywhere else in the last 40 months after landing and silica makes nine tenths of composition of some of the rocks. The high silica was a surprise, the scientist said. And it supports microbal life.
Read more:
http://phys.org/news/2015-12-mars-rover-higher-silica-considerable.html
MansourJE (talk) 06.35, 23 December 2015 (UTC)
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I added a little on the distance. When I get time I may add more if someone doesn't do it first. I think a section should be added to the article on the distance from earth to mars, how it varies, etc. I recommend that in the box on Orbital Characteristics, some stats be added on distance from earth to mars. (PeacePeace (talk) 21:56, 30 September 2017 (UTC))
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Can someone have a go at disentangling these two statements:
"Mars's cycle of eccentricity is 96,000 Earth years compared to Earth's cycle of 100,000 years.[176] Mars has a much longer cycle of eccentricity, with a period of 2.2 million Earth years, and this overshadows the 96,000-year cycle in the eccentricity graphs."
Which is it? 96k years or 2.2m years? I am going to guess that both numbers have their uses, but their identification is in error. Or there are two interacting cycles in the fashion of Milankovich cycles and they need to be better distinguished.
50.100.172.151 (talk) 15:37, 2 December 2017 (UTC)
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"In 1840, Mädler combined ten years of observations and drew the first map of Mars".
and then, further, it says
"The first person to draw a map of Mars that displayed any terrain features was the Dutch astronomer Christiaan Huygens.[260]"
I think that these two statements contradict each other, don't you think? IlnarSelimcan (talk) 00:10, 14 December 2017 (UTC)
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There is an error in Mars atmosphere text: It says - "The highest atmospheric density on Mars is equal to that found 35 km (22 mi)[141] above Earth's surface." - should be - "The mean atmospheric density on Mars is equal to that found 35 km (22 mi)[141] above Earth's surface." 87.95.32.38 (talk) 17:03, 15 December 2017 (UTC)
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The distances from Mars to the Sun are listed as:
Aphelion 249.2 GM Perihelion 206.7 GM Semi-major axis 227.9392 GM I think those should be in Million kilometers, rather than Billion meters. The entries for Mercury, Venus, Earth, Jupiter and Saturn are listed in Million Kilometers, and the use of GM (Gigameters) for the distances to Mars is confusing. The Planetary Fact Sheet for NASA uses only Million kilometers. [1]
The distances for the pages for Uranus and Pluto are also listed in GM, which I think are misleading. Spacedad2 (talk) 12:05, 8 January 2018 (UTC)
References
"The summer temperatures in the south can be up to 30 K (30 °C; 54 °F) "
This is obviously wrong. 30C is a hell of a lot hotter than 30K
Aluminium Colours (talk) 03:14, 8 February 2018 (UTC)
"The summer temperatures in the south can be warmer than the equivalent summer temperatures in the north by up to 30 °C (54 °F)."so that nobody else falls into that trap. Thanks for letting us know - this is how articles get improved... -- Begoon 12:41, 9 February 2018 (UTC)
Why is Mars gravity only mentioned under the Atmosphere heading, only referenced indirectly? If one is scanning the page, that isn't a likely place in the text where people would look. Could you/someone reference Mars gravity (38% of Earth's) at the top of the article, including it with Mars's most basic features? Thanks! 71.212.148.173 (talk) 20:57, 12 May 2018 (UTC)
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can i please edit the page as mars is not the second smallest planet in the solar system. 183.83.222.20 (talk) 11:24, 3 April 2018 (UTC)
Venus is also smaller than mars. — Preceding unsigned comment added by 183.83.222.20 (talk) 11:31, 3 April 2018 (UTC)
Mousing over or clicking this label in the box gives the same result as orbital period. — Preceding unsigned comment added by 70.113.85.76 (talk) 23:29, 13 June 2018 (UTC)
In the "Orbit and rotation" section, two consecutive sentences about the cycle of eccentricity are inconsistent:
Mars's cycle of eccentricity is 96,000 Earth years compared to Earth's cycle of 100,000 years. Mars has a much longer cycle of eccentricity, with a period of 2.2 million Earth years, and this overshadows the 96,000-year cycle in the eccentricity graphs.
I.e., "96,000 Earth years" vs. "2.2 million Earth years".
This needs clarification or correction.
BMJ-pdx (talk) 18:27, 13 June 2018 (UTC)
I removed the information on closest perihelion and aphelion from the "Orbit and rotation" section, as it was several years old. The next peri/aphelion changes every year, but it is still an interesting bit of information. Do you think it should be in the article? We could make a table with several next peri/aphelions, so it at least doesn't need so many updates. (Or possibly in Orbit of Mars, because it would take too much space here?) --Šedý (talk) 08:55, 21 June 2018 (UTC)
There is an article at AfD that may interest you. The article is here Modern Mars habitability. Please vote or comment at WP:Articles for deletion/Modern Mars habitability
Robert Walker (talk) 16:20, 18 August 2018 (UTC)
The new values of brightest and faintest apparent magnitude in the 'infobox' were reported in a peer-reviewed journal article that includes updated equations for computing planetary magnitudes. Those formulas will be used to predict magnitudes for future issues of The Astronomical Almanac published by the U.S. Naval Observatory and Her Majesty’s Nautical Almanac Office. The equations were solved at daily intervals over long periods of time in order to determine the magnitude extremes. The paper in Astronomy and Computing can be located at https://doi.org/10.1016/j.ascom.2018.08.002.
As noted in the journal article, the apparent brightness of Mars depends on the surface longitude being illuminated by the Sun and being viewed by the observer as well as the longitude of the planet in its orbit around the Sun. The extreme magnitudes reported here take those factors into account.
The magnitudes in the section on ‘viewing’ need to be updated. The section also needs to be rewritten since there are misstatements and unsupported statements. For example “Mars usually appears distinctly yellow, orange, or red; the actual color of Mars is closer to butterscotch, and the redness seen is just dust in the planet's atmosphere.” The redness is definitely not just dust in the atmosphere. Many broad areas of the planet's surface are reddish. That is followed by a discussion of pictures taken with a Mars rover which ought to be removed or modified since the section describes observations made from Earth. — Preceding unsigned comment added by Planet photometry (talk • contribs) 16:53, 10 September 2018 (UTC)
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In a previous edit the mean anomaly (a fundamental orbital element) for Mars was dropped from the infobox. The code is still there, but it's missing a value. Please add back in the following: mean_anomaly = 19.373°
143.215.30.216 (talk) 22:03, 3 July 2018 (UTC)
The mean anomaly of Mars at J2000.0 is not 320.45776°, I don't know where that number comes from. According to the Mars fact sheet[1]. it should be in the region of 19.4°, as the Longitude of perihelion is 336.04084° and the Mean Longitude is 355.45332° - see Mean longitude - Formulae. All the Mean anomaly values on Wikipedia for the other planets agree with the NASA datasheets within 1%, apart from Mars. Please consider correcting this error. Oobayly (talk) 15:57, 13 October 2018 (UTC)
References
On Martian average gravity, the infobox gives three different data: 0.376 g, 3.711 m/s² (0.378 g) and 12.18 ft/s² (0.379 g). Only one of them can be correct. Actually, Mars' gravity is 12.211 ft/s² (0.37952948254501 g), so the value given in imperial units is closest, but still wrong. Please correct it! [11]. --212.186.15.191 (talk) 09:21, 27 November 2018 (UTC)
Added the mean apparent magnitude and its standard deviation. Also mentioned that Mars (and Jupiter) are the brightest planets apart from Venus. Removed the unsupported statement that the color of Mars is “butterscotch”. Also removed the incorrect statement that “the redness seen is just dust in the planet’s atmosphere” since there are many large reddish area on the surface which give the planet its color. — Preceding unsigned comment added by Planet photometry (talk • contribs) 16:12, 13 September 2018 (UTC)
According to this article (https://owlcation.com/stem/True-Color-Photos-of-All-the-Planets) the true color of mars is nothing like the first image on this article (https://en.wikipedia.org/wiki/Mars#/media/File:OSIRIS_Mars_true_color.jpg). Have I misunderstood something? Should we change the image perhaps? — Preceding unsigned comment added by Dlesos (talk • contribs) 14:07, 11 April 2019 (UTC)