MARK GARLICK / SCIENCE PHOTO LIBRARY MARK GARLICK / SCIENCE PHOTO LIBRARY
Early Earth. Computer artwork of meteorites falling on a young Earth during its formation. At this stage, the surface of the Earth was mostly volcanic. The meteorites are seen as bright tracks as they partly burn up in the Earth's primitive atmosphere. The Earth is thought to have formed around 4.6 billion years ago from the accretion of rocks and dust.
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