NASA and JPL launch Mariner 9, the only surviving specimen of two identical “Mars ’71” orbiters designed to visit Mars (Mariner 8 has already been launched and then lost in a launch accident). After nearly six months of travel, Mariner 9 will take up permanent residence around the red planet.
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Also of interest...
Galileo gawks at Gaspra
October 29, 1991
New Horizons launched
January 19, 2006
Mariner 4: first pictures from Mars
July 15, 1965