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Mariner 10 was an American space probe that explored the inner solar system. It remains significant as the first spacecraft to visit Mercury and the only probe to study that planet until many decades later.
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Reprocessed Mariner 10 data was used to produce this image of Mercury. The smooth band is an area of which no images were taken.
Mariner 10 was an American robotic space probe launched by NASA on 3 November 1973, to fly by the planets Mercury and Venus. It was the first spacecraft to visit Mercury and the first to perform a flyby of multiple planets.