Three astronauts, Richard J. Hieb, Thomas D. Akers, and Pierre J. Thuot, simultaneously walked in space for the first time.
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The US Air Force Space Command launched the Boeing X-37B spaceplane for a classified mission.
Two Earth-like planets in one solar system were discovered.
The first American satellite, Explorer 1, was launched into space.
The US Air Force launched the Discoverer 1 reconnaissance satellite.
NASA's Lunar Orbiter 2 launched atop an Atlas Agena rocket from Cape Canaveral in Florida.