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Small moons might have rained down on the early Earth, splattering it with debris that helped shape our young world and potentially built the first continent.

Scientists have long suspected that the moon was formed when a Mars-sized object named Theia collided with the proto-Earth roughly 100 million years after the formation of the solar system. The crash threw molten rock into orbit that coalesced to form our planetary companion. But at the Technion Israel Institute of Technology in Haifa, Israel, and his colleagues argue that the crash wasn’t a singular…