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Mariner 10

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Mariner 10
The First to Complete a Mercury Flyby
A robotic space probe launched on November 3, 1973 to fly by the planets Mercury and Venus. The mission objectives were to measure Mercury's environment, atmosphere, surface, and body characteristics and to make similar investigations of Venus. Mariner 10 was the first spacecraft to make use of an interplanetary "gravitational slingshot" maneuver, using Venus to bend its flight path and bring its perihelion down to the level of Mercury's orbit.

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