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Historical satellite image4/7/2023 ![]() Mariner 9's imaging was delayed by a huge Martian sandstorm that obscured most of the surface, but when the dust died down, it sent the first images of Red Planet volcanoes and the huge Valles Marineris (a canyon) back to Earth. Mariner 9 carried out the mission objectives of both spacecraft, mapping 70% of the Martian surface and studying changes on the surface and in the atmosphere. ![]() 14, 1971, making it the first spacecraft to orbit another planet. Mariner 9 succeeded and arrived safely to Mars orbit on Nov. NASA's Mariner 9 mission was originally supposed to be part of a two-spacecraft set orbiting Mars, but Mariner 8 never made it into space. (Image credit: NASA) First spacecraft to orbit Mars: Mariner 9 (1971)
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