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Saturday, February 25, 2017
Mariner 6, spacecraft to Mars, launched 1969
Mariner 6, one of two probes to explore Mars, launched February 25, 1969. Mariner 7 launched the following month. Mariner 6 made its closest approach to Mars on July 31, 1969, less than a week after Apollo 11's mission. As a consequence, Mariner 6's achievements did not receive the attention it should have.