Some 4.5 billion years ago, a Mars-sized object smashed into the nascent Earth, spinning off our moon.
The collision left behind mysterious blobs within Earth's interior that may have helped kick off plate tectonics.
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Some 4.5 billion years ago, a Mars-sized object smashed into the nascent Earth, spinning off our moon.
The collision left behind mysterious blobs within Earth's interior that may have helped kick off plate tectonics.