Earth was smashed by a rock the size of Mars to make the moon


NASA/JPL-Caltech By Shannon Hall A little rock can pack a mighty punch. The object that smashed into Earth 4.5 billion years ago to create the moon was relatively small – roughly one-tenth the mass of Earth, according to the latest modelling. Since the 1970s, astronomers have suspected that the moon was created when a giant protoplanet called Theia struck the newly formed Earth. The collision created a cloud of debris, which quickly coalesced into our planet’s partner. There’s just one nagging problem: this idea, known as the giant-impact hypothesis,
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