Planetoid crashing into primordial Earth
Autor:
Don Davis (work commissioned by NASA)
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1431 x 1083 Pixel (118290 Bytes)
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Artist's impression of a 1000km-diameter planetoid hitting a young Earth. Artist's description: "A planetoid plows onto the primordial Earth, during the eons of time when conditions were ripe for the development of life. It is possible that life of kinds unknown to us appeared repeatedly only to be destroyed in collisions like this one which could 'rework' the entire surface. Fortunately the average size of debris declined sharply through geologic time, but the supply of wayward rocks a few kilometers in size is by no means exhausted."
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Public domain
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