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Deimos, one of the two moons of Mars, is a teeny little guy with an average radius of just 6.2 km.

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Phobos: Doomed Moon of Mars. Its orbit is so close to Mars that gravitational forces will cause it to shatter.

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#OnThisDay in 1877 American astronomer Asaph Hall discovers the Mars moon Deimos.

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Phobos, the larger and closer moon, occults Deimos, the smaller and more distant moon in the Martian sky. Image credit: NASA/JPL-Caltech/Malin Space Science Systems/Texas A&M Univ.

Stickney Crater Image Credit: HiRISE, MRO, LPL (U. Arizona), NASA Stickney Crater, the largest crater on the martian moon Phobos, is named for Chloe Angeline Stickney Hall, mathematician and wife of astronomer Asaph Hall. Asaph Hall discovered both the Red Planet's moons in 1877. Over 9 kilometers across, Stickney is nearly half the diameter of Phobos itself, so large that the impact that blasted out the crater likely came close to shattering the tiny moon.

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