Dec. 20, 2017, 12:36 p.m.
Mariner 9 Sees Shield Volcano on Mars
On November 14, 1971, Mariner 9, the first spacecraft to orbit the Red Planet, took this image of a shield volcano on Mars.
On November 14, 1971, Mariner 9, the first spacecraft to orbit the Red Planet, took this image of a shield volcano on Mars.
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