Notable events in the history of human space exploration: — Oct. 4, 1957: First artificial satellite, Sputnik I, is launched by Soviet Union. — April 12, 1961: Soviet cosmonaut Yuri Gagarin completes ...
This article was originally published at The Conversation. The publication contributed the article to Space.com's Expert Voices: Op-Ed & Insights. At an internal staff briefing last week, acting NASA ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results
Feedback