Luna 10 was launched by the USSR and became the first satellite to orbit the moon.
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NASA launched the Explorer 11 satellite atop a Juno II rocket from Cape Canaveral, Florida.
NASA's Voyager 1 spacecraft entered interstellar space, becoming the first artificial object to do so.
Space Shuttle Challenger exploded just 73 seconds after takeoff, killing all seven crew members.
The TIROS satellite transmitted the first-ever TV picture from space.
The unmanned space mission Luna 21 was launched.
