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The Earth suffered heavy bombardment until 3.8 billion years ago
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An asteroid the size of Mars crashed into the Earth and formed the moon.
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The Earth began to cool from 4.5 billion years ago and its surface became solid around 3.8 billion years ago.
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The core of the Earth was formed 4.54 billion years ago.
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The Earth formed 4.6 billion years ago from stardust
