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Page last updated at 07:52 GMT, Thursday, 4 August 2011 08:52 UK

Earth's 'two moon' mystery


Scientists working on a new theory have suggested that the earth once had two moons, but that they collided to form one.

The man behind the theory, Erik Asphaug from the University of California at Santa Cruz, describes how another moon may have been "squashed flat" in a cosmic collision.

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