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This artist's impression shows a large planetoid crashing into the primordial Earth. In the last stages of the formation of Earth (4.5 billion years ago), it may have been struck a few times by objects about the size of Pluto (1,500 - 2,000 miles across). Earth has not experienced anything like this impact since that early time. [Image Credit: Don Davis/NASA]
This artist's impression shows a large planetoid crashing into the primordial Earth. In the last stages of the formation of Earth (4.5 billion years ago), it may have been struck a few times by objects about the size of Pluto (1,500 - 2,000 miles across). Earth has not experienced anything like this impact since that early time. [Image Credit: Don Davis/NASA]