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  • ...become ever more dense until they collapse inward under gravity to form [[protoplanet]]
    25 KB (3,867 words) - 00:16, 13 December 2020
  • ...impact theory]], states that it formed from the collision of a Mars-size [[protoplanet]] called Theia with the early Earth. This hypothesis explains (among other
    54 KB (8,201 words) - 00:29, 13 December 2020