MARK GARLICK / SCIENCE PHOTO LIBRARY MARK GARLICK / SCIENCE PHOTO LIBRARY
Early Earth. Computer illustration of meteorites falling on a young Earth during its formation. Explosions on the surface of the Moon (upper right) show a similar process is taking place there. The Earth is thought to have formed around 4.6 billion years ago from the accretion of rocks. The Moon is thought to have coalesced from the debris of a collision between the young Earth and a similar but smaller body.
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