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The Earth never collapsed. In the beginning of formation (about 4.6 billion years ago), however, it is theorized that a protoplanet, the size of Mars, sideswiped the Earth and caused a portion of both to break apart. The pieces came together and formed the Moon. It is also theorized that the Earth became a snow ball twice. There were also asteroid impacts on Earth, some severe enough to end most of life, but the Earth itself stayed intact.

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14y ago

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