Mars' larger moon Phobos is slowly falling apart, NASA says

Phobos, a moon of Mars, is essentially a pile of rubble covered by a thick layer of regolith. Satellite images reveal grooves on its surface, which are believed to be caused by stress from Mars' gravitational pull. These tidal forces are intensifying as Phobos orbits just 6,000 kilometers from Mars, drawing it closer by about 2 meters every century. Scientists predict that these forces will eventually lead to Phobos' destruction in 30 to 50 million years.

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