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{{See also|Galactic habitable zone|Extragalactic planet|Globular cluster#Planets}} |
{{See also|Galactic habitable zone|Extragalactic planet|Globular cluster#Planets}} |
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[[File:Planet Discovery Neighbourhood in Milky Way Galaxy.jpeg|thumb|300px|90% of planets with known distances are within about 2000 [[light years]] of Earth, as of July 2014.]] |
[[File:Planet Discovery Neighbourhood in Milky Way Galaxy.jpeg|thumb|300px|90% of planets with known distances are within about 2000 [[light years]] of Earth, as of July 2014.]] |
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The [[Milky Way]] is 100,000 light-years across, but 90% of planets with known distances are within about 2000 [[light years]] of Earth, as of July 2014. One method that can detect planets much further away is [[microlensing]]. The |
The [[Milky Way]] is 100,000 light-years across, but 90% of planets with known distances are within about 2000 [[light years]] of Earth, as of July 2014. One method that can detect planets much further away is [[microlensing]]. The [[WFIRST]] spacecraft could use microlensing to measure the relative frequency of planets in the [[galactic bulge]] versus the [[galactic disk]].<ref>[http://exep.jpl.nasa.gov/exopag/exopag9/agenda/jyee_ExoPAG9.pdf SAG 11: Preparing for the WFIRST Microlensing Survey] {{Webarchive|url=https://web.archive.org/web/20140222134148/http://exep.jpl.nasa.gov/exopag/exopag9/agenda/jyee_ExoPAG9.pdf |date=February 22, 2014 }}, Jennifer Yee</ref> So far, the indications are that planets are more common in the disk than the bulge.<ref>[http://science.gsfc.nasa.gov/660/seminars/ASDcolloq/fall2010.html Toward a New Era in Planetary Microlensing] {{Webarchive|url=https://web.archive.org/web/20141103160816/http://science.gsfc.nasa.gov/660/seminars/ASDcolloq/fall2010.html |date=November 3, 2014 }}, Andy Gould, September 21, 2010</ref> Estimates of the distance of microlensing events is difficult: the first planet considered with high probability of being in the bulge is [[MOA-2011-BLG-293Lb]] at a distance of 7.7 kiloparsecs (about 25,000 light years).<ref>[https://arxiv.org/abs/1310.3706 MOA-2011-BLG-293Lb: First Microlensing Planet possibly in the Habitable Zone], V. Batista, J.-P. Beaulieu, A. Gould, D.P. Bennett, J.C Yee, A. Fukui, B.S. Gaudi, T. Sumi, A. Udalski, (Submitted on October 14, 2013 (v1), last revised October 30, 2013 (this version, v3))</ref> |
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Greek: Ά ά Έ έ Ή ή Ί ί Ό ό Ύ ύ Ώ ώ Α α Β β Γ γ Δ δ Ε ε Ζ ζ Η η Θ θ Ι ι Κ κ Λ λ Μ μ Ν ν Ξ ξ Ο ο Π π Ρ ρ Σ σ ς Τ τ Υ υ Φ φ Χ χ Ψ ψ Ω ω {{Polytonic|}}
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