History of the Universe

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Meteorite Era

During the first half billion years of the solar systemís history many objects called meteorites hit the Earth and other planets, making large holes called craters.

Craters on Moon photograph by NASA/JPL

These meteorites were the last of the planetesimals being swept up by the planets. On most planets the craters can still be seen, but on Earth the weather has worn away signs of most of them.

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