Magellan reaches the Pacific, William Shakespeare gets hitched, the Grand Ole Opry debuts, Olympic gymnast Nadia Comaneci defects, and Jeffrey Dahmer is killed in prison, all on this day.
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NASA
1964: NASA launches the Mariner 4 probe toward Mars. In July 1965, the spacecraft would perform the first successful flyby of Mars, returning the first pictures of the Martian surface.