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Mars Moon: Deimos

An image of Deimos

Discovered by Asaph Hall in 1877, Deimos is a dark, crater filled satellite. It is the smaller of the two diminutive moons of Mars. Like its sister satellite Phobos, Deimos appears to be a C-class asteroid that was captured in the remote past by the Martian gravitational field.

However, it displays none of the grooves and crater chains found on Phobos, while many of its craters are less distinct, probably because of infilling by crater ejecta that may lie tens of meters thick on the surface. The larger craters, such as Voltaire and Swift, measure only about 2 kilometers across. Deimos (meaning panic) was named after an attendant of the Roman war god, Mars.

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