WALTER MYERS / SCIENCE PHOTO LIBRARY WALTER MYERS / SCIENCE PHOTO LIBRARY
Early Earth impact. Computer artwork showing an object about 10 miles in diameter impacting the molten, infant Earth (orange). This impact would have released around 200 million times as much energy as the largest man-made explosion. The Earth accrued the majority of its mass during the 100 million years following the formation of the Sun, a period referred to as the cosmic bombardment.
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