Phobos

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Phobos Larger of the two satellites of Mars. Discovered in 1877 by Asaph Hall, it is a dark, irregular body measuring 27 × 22 × 19km (17 × 14 × 12mi). It may well be a captured asteroid. It has two large craters, named Stickney and Hall.

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Phobos

views updated May 08 2018

Phobos
1. A Soviet mission to Mars, launched in 1988.

2. One of the two satellites of Mars.

A Dictionary of Earth Sciences AILSA ALLABY and MICHAEL ALLABY

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Phobos

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