Season 18 Episodes12
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During 1974 there have been some important and spectacular space missions. In the spring Mariner 10 sent back the first close-range pictures of cloud-covered Venus and crater-scarred Mercury. Then, early in December, Pioneer II made a close rendezvous with Jupiter, the only planet known to
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"The Year of the Planets" is episode 12 of The Sky at Night season 18. It aired on December 18, 1974.