Phobos was discovered in 1877 by the American astronomer Asaph Hall. Both Phobos and Mars' other moon, Deimos, are thought to be captured asteroids.
Phobos' orbit around Mars is dropping by about 1.8m (5.9ft) every 100 years. This means that in 50 million years it will either crash into Mars or break up into a ring.
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