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Venus - Mercury Mission |
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Mariner 10, shown in this artist's rendering, was the last in a series of Mariner missions designed to survey other planets in the solar system. Launched in November 1973, this mission provided new information about Mercury and Venus in the Mariner program's first dual-planet mission. On February 5, 1974, Mariner 10 made its first flyby of Venus and discovered evidence of rotating clouds. Beginning in March 1974, Mariner 10's three flybys past Mercury mapped about half of the planet's surface, during which time a thin atmosphere and a magnetic field were discovered.
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