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Lunar geology

Simulation of a meteorite impact on the lunar surface, March 17, 2013. Image: NASA

NASA: A bright explosion on the moon was caused by a meteor impact weighing 30-40 kg

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Four visualizations from a computer simulation showing the collision between the moon and a smaller companion moon. The simulation shows that most of the contents of the small moon come together and become a pancake-like layer that currently constitutes the mountainous area on one side of the moon - the side far from Earth. Illustration: M. Jutzi and E. Asphaug, Nature.

A second moon orbited the Earth billions of years ago

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