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A gigantic collision led to the formation of Earth's Moon



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A gigantic collision led to the formation of Earth's Moon
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This artist's impression illustrates the collision theory. At the dawn of the Solar System a heavenly body the size of Mars probably hit the young Earth. As a result, material from the rocky mantle of the heavenly body and of the Earth was hurled into space. This collected in the shape of a ring on a path closely orbiting the Earth, where it then gradually 'clumped together' to form the Moon.

Credit: NASA/Joe Tucciarone.