Cosmonaut Alexey Leonov made the first spacewalk when he left his Voskhod 2 spacecraft.
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Jupiter's moon was found to have a liquid ocean under a thick crust of ice.
The Cosmic Call 2 mission occurred at the Eupatoria Planetary Radar in western Crimea.
The National Space Development Agency of Japan selected Mamoru Mohri, Chiaki Mukai, and Takao Doi as Japan’s first astronauts.
The population of space hit a new record with 13 astronauts.
Charles Messier discovered the Whirlpool Galaxy.
