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Phobos

Supposedly the small moon is a asteroid captured my Mars. On its surface is the 10 km big crater Stickney.

Distance to Mars: 9378 km
Mass: 1.08 * 1016 kg
Diameter: 22.2 km
Orbit period: 7.66 hours

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    Phobos
Phobos with Stickney.
Photo: Nasa

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