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EVER to hit the Earth? Probably the Mars-sized body that hit the Earth about 4 billion years ago and created the Moon from the debris.

After that may have been the body that caused the Permian Extinctions, about 250 million years ago. That one killed about 95% of all life on Earth. There were other ancient collisions, but that was too long ago to even approximately figure their ages. And there isn't any way to estimate how BIG those impactors were. If they were any larger, they would have sterilized the planet.

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16y ago

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