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More than 4.5 billion years ago, a huge world, potentially as large as the moon or even Mars, traveled around the young Sun before a violent collision shattered it into pieces.
Scientists now say they have found the first direct evidence that this long-lost planetary embryo, known as a protoplanet, once existed. The discovery, described in the journal Earth and Planetary Science Letters, points to a type of planetary evolution unlike anything previous...
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