Phobos, Deimos, Gaspra
Martian moons Phobos and Deimos are compared to asteroid 951 Gaspra.
This montage shows asteroid 951 Gaspra (top), Deimos (lower left), and Phobos (lower right) at the same scale and nearly the same lighting conditions. (For scale, Gaspra is about 10 miles, or 17 kilometers, long.) However, their surfaces appear remarkably different, possibly because of differences in composition or because of different impact histories. All three bodies have irregular shapes, due to past catastrophic conditions. Phobos and Deimos were imaged by the Viking orbiter in 1977, while the Gaspra image is one obtained by the Galileo spacecraft on October 29, 1991.

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