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violent massive impact mars moons
Artist's impression of the giant impact that would have given birth to Phobos and Deimos. The colliding object is about 1/3 the size of Mars—which at the time may have had a thicker atmosphere and water on its surface.
Mars Originally had 10 Moons and One Giant Moon That All Collided Together

ByAna Verayo | Jul 05, 2016 06:54 AM EDT

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