Apollo 1 test launch failed, and astronauts Gus Grissom, Ed White, and Roger B. Chaffee all died.
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NASA's Voyager 2 came into close contact with Uranus and captured many images that uncovered 11 new moons.
The Soviet Union's ill-fated Soyuz 11 mission was launched from the Baikonur Cosmodrome.
The National Oceanic and Atmospheric Administration's ITOS-B weather satellite launched atop a Delta rocket.
NASA's Apollo 10 mission returned to earth after successfully testing all possible elements of a Moon landing.
The Soviet Union's Luna 5 uncrewed spacecraft crash-landed on the Moon.
