Season 21 Episodes13
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Celebrates its 20th anniversary
Apr 20, 1977
In April 1957 The Sky at Night began. It could not have started at a better time; within months the Space Age opened, with the launch of Sputnik 1, and over the next few years astronomy saw some of the most spectacular advances of all
Seasons70
Episode Summary
"Celebrates its 20th anniversary" is episode 4 of The Sky at Night season 21. It aired on April 20, 1977.