Mars Moon Impact

Bildnummer 13405130
Mars Moon Impact
Astronomers at the University of Zurich believe that Mars; two present satellites, Phobos and Deimos, are the product of an impact early in Mars' history. By tracing their orbits back in time, they estimate that they originated from a single point. This, the scientists say, is evidence that Mars initially had a single, larger moon, which was split in two following a collision with another object.
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Credit: Science Photo Library / Garlick, Mark
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