A new study says the collision with a proto-planet called Theia 4.5 billion years ago left remnants deep inside Earth — and also created the moon.
Scientists proposed a novel idea on Wednesday that could solve two of the world's mysteries at once — one that passes over our heads every night, and one that sits far below our feet.The first mystery has puzzled everyone from scientists to inquisitive children for millennia: where did the moon come from?The leading theory — known as the Giant Impact Hypothesis — is that the moon was created 4.5 billion years ago when a would-be planet the size of Mars smashed into the still-forming Earth.
Yuan said that when Theia smashed into proto-Earth, it was traveling at more than six miles a second, a speed that allowed some of it to penetrate 'very deep into the Earth's lower mantle.'A video developed by the team simulating this process illustrates how clumps of Theia's mantle tens of miles wide swirled inside Earth.
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