Editing 1965 in science (section)

==Astronomy and space exploration==
* February 20 – [[Ranger 8]] crashes into the [[Moon]] after a successful mission of photographing possible landing sites for the [[Apollo program]] [[astronaut]]s.
* March 23 – [[NASA]] launches [[Gemini 3]], the [[United States]]' first two-person space flight (crew: [[Gus Grissom]] and [[John Young (astronaut)|John Young]]).
* August 21 – [[NASA]] launches [[Gemini 5]] ([[Gordon Cooper]], [[Pete Conrad]]) on the first 1-week space flight, as well as the first test of [[fuel cell]]s for electrical power on such a mission.
* November 16 – [[Venera program]]: The [[Soviet Union]] launches the [[Venera 3]] space probe from [[Baikonur]], [[Kazakhstan]] toward [[Venus]]. (On March 1, 1966, it becomes the first spacecraft to reach the surface of another [[planet]]).
* November 26 – At the [[Hammaguir]]a launch facility in the [[Sahara Desert]], [[France]] launches a  [[Diamant-A]] rocket with its first [[satellite]], ''[[Astérix (satellite)|Astérix-1]]'' on board, becoming the third country to enter [[Outer space|space]].
* Discovery of [[NML Cygni]], a red [[hypergiant]] and the largest star known, at about 1,650 times the Sun's radius.