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Image of Phobos
FEARSOME PHOBOS: This moon is doomed! Taking its name from the Greek word for fear, Phobos is one of two moons of Mars. They are both likely captured asteroids originating in the main asteroid belt between Mars and Jupiter, or perhaps from even more distant reaches of the Solar System. Phobos orbits very close to Mars, and the strong gravitational tidal forces are taking their toll. In about 100 million years, Phobos will likely be shattered by the stress of the relentless tidal forces, and the debris may form a decaying ring around Mars. Image Credit: NASA/JPL-Caltech
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