America’s robot spacecraft, the Viking I, successfully landed on Mars.
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Mars made its closest approach to Earth in nearly 60,000 years.
Syncom 2, the world's first geosynchronous communications satellite is launched.
The Soviet Union's Zond 1 space probe was launched from the Baikonur Cosmodrome.
The Soviet spacecraft Luna I became the first to pass the moon.
NASA launched the Explorer 11 satellite atop a Juno II rocket from Cape Canaveral, Florida.
