1990 in science

January 24 – Japan launches the Hiten spacecraft, the first lunar probe launched by a country other than the Soviet Union or the United States.
February 14 – The Pale Blue Dot photograph of Earth is sent back from the Voyager 1 probe after completing its primary mission, from around 3.5 billion miles away.
April 24 – The Space Shuttle Discovery places the Hubble Space Telescope into orbit.^[1]
August 16 – Steven Balbus makes his first discovery leading to elucidation of magnetorotational instability.^[2]
October 13 – Earth-grazing meteoroid of 13 October 1990: A 44 kilogram, 41.5 km/s meteoroid passes above Czechoslovakia and Poland at 97.9 km. It is the first time calculations of the orbit of such a body based on photographic records from two distant places is made.^[3]

The term "rewilding" is first used in print.^[4]

February – Adobe Photoshop 1.0 graphics software, devised by Thomas Knoll, is released.^[5]
May 22 - Windows 3.0 is shipped by Microsoft
November 12 – Tim Berners-Lee publishes a more formal proposal for the World Wide Web.^[6]
November 13 – The first known web page is written.^[7]
Approx. November 22 – Satoshi Tajiri begins creating the first Pokémon game.^[8]

Thomas W. Laqueur publishes Making Sex: Body and Gender From the Greeks to Freud (Harvard University Press).

Alan E. Gelfand and Adrian Smith publish a paper drawing attention to the significance of the Gibbs sampler technique for Bayesian numerical integration problems.^[9]
Victor Kolyvagin introduces Euler systems.^[10]
Ruth Lawrence publishes a paper on homological representations of the Hecke algebra, introducing, among other things, certain novel linear representations of the braid group, the Lawrence–Krammer representation.^[11]

August 12 – "Sue", the best preserved Tyrannosaurus rex specimen ever found, is discovered in South DakotabySue Hendrickson.

June 25 – Cruzan v. Director, Missouri Department of Health decided in the Supreme Court of the United States allowing public officials to intervene in questions of termination of life support in the absence of an advance healthcare directive.
The Human Genome Project is founded.
The first evidence for the existence of the BRCA gene encoding for a DNA repair enzyme involved in breast cancer susceptibility Is provided by Mary-Claire King's laboratory at University of California, Berkeley.^[12]

Roger Shepard's Mind Sights presents the "Shepard tables" illusion.^[13]

Fields Prize in Mathematics: Vladimir Drinfeld, Vaughan Frederick Randal Jones, Shigefumi Mori and Edward Witten
Nobel Prizes
- Physics – Jerome Isaac Friedman, Henry Way Kendall and Richard E. Taylor
- Chemistry – Elias James Corey
- Medicine – Joseph E. Murray and E. Donnall Thomas
Turing Award – Fernando J. Corbató

September 28 – Nadim Kobeissi, Lebanese computer science researcher

January 4 – Prof. Doc Edgerton, (b. 1903), American electrical engineer.
January 14 – Rosalind Pitt-Rivers (b. 1907), English biochemist.
January 26 – Lewis Mumford (b. 1895), American historian and philosopher of science.
February 19 – Edris Rice-Wray Carson (b. 1904), American-born physician, pioneer in family planning.
March 20 – Victor Rothschild, 3rd Baron Rothschild (b. 1910), English polymath.
March 22 – Gerald Bull (b. 1928), Canadian engineer.
March 24 – An Wang (b. 1920), Chinese American computer designer.
May 30 – Ora Mendelsohn Rosen (b. 1935), American biomedical researcher.
August 18 – B. F. Skinner (b. 1904), American behavioral psychologist.
September 2 – John Bowlby (b. 1907), English child psychologist and pioneer of attachment theory.
October 9 – Murray Bowen (b. 1913), American psychiatrist and pioneer of family therapy.
October 17 – Hans Freudenthal (b. 1905), Dutch mathematician.
November 19 – Georgy Flyorov (b. 1913), Russian physicist known for his discovery of the spontaneous fission.

^ "STS-31". Mission Archives. NASA. 2006-10-14. Retrieved 2013-01-17.

^ Balbus, Steven A.; Hawley, John F. (1991). "A powerful local shear instability in weakly magnetized disks". The Astrophysical Journal. 376: 214–233. Bibcode:1991ApJ...376..214B. doi:10.1086/170270.

^ Spurný, P.; Ceplecha, Z.; Borovicka, J. (1991). "Earth-grazing fireball: Czechoslovakia, Poland, October 13, 1990, 03h27m16sUT". WGN. 19 (1): 13. Bibcode:1991JIMO...19...13S. Aphelion of its orbit changed from 2.80 AU to 1.80 AU.

^ Foote, Jennifer (1990-02-05). "Trying to Take Back the Planet". Newsweek.

^ Hormby, John (2007-06-05). "How Adobe's Photoshop Was Born". Story Photography. Archived from the original on 2007-06-11. Retrieved 2007-06-15.

^ Berners-Lee, T.; Cailliau, R. (12 November 1990). "WorldWideWeb: Proposal for a HyperText Project". Archived from the original on 2012-12-19. Retrieved 2011-11-29.

^ "Links and Anchors". Retrieved 2011-11-29.

^ Larimer, Tim (1999-11-22). "The Ultimate Game Freak". Time. Vol. 154, no. 20. Asia. Retrieved 2015-02-02.

^ Gelfand, A. E.; Smith, A. F. M. (1990). "Sampling-Based Approaches to Calculating Marginal Densities". Journal of the American Statistical Association. 85 (410): 398–409. doi:10.2307/2289776. JSTOR 2289776.

^ Kolyvagin, V. A. (1990), "Euler systems", The Grothendieck Festschrift, Vol. II, Progress in Mathematics, vol. 87, Boston: Birkhäuser, pp. 435–483, doi:10.1007/978-0-8176-4575-5_11, ISBN 978-0-8176-3428-5, MR 1106906

^ Lawrence, R. J. (1990). "Homological representations of the Hecke algebra" (PDF). Communications in Mathematical Physics. 135 (1): 141–191. Bibcode:1990CMaPh.135..141L. doi:10.1007/BF02097660. S2CID 121644260. Retrieved 2011-11-29.

^ Hall, J. M.; Lee, M. K.; Newman, B.; Morrow, J. E.; Anderson, L. A.; Huey, B.; King, M. C. (December 1990). "Linkage of early-onset familial breast cancer to chromosome 17q21". Science. 250 (4988): 1684–9. Bibcode:1990Sci...250.1684H. doi:10.1126/science.2270482. PMID 2270482.

^ Colman, Andrew M. (2009). A Dictionary of Psychology (3 ed.). Oxford University Press. ISBN 9780191726828. The illusion was first presented by the US psychologist Roger N(ewland) Shepard (born 1929) in his book Mind Sights: Original Visual Illusions, Ambiguities, and Other Anomalies (1990, p. 48), Shepard commented that 'any knowledge or understanding of the illusion we may gain at the intellectual level remains virtually powerless to diminish the magnitude of the illusion' (p. 128).

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