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The early Earth was bombarded by rocks from space, even after life had formed. Researchers are studying the implications of a meteorite that pummeled our planet 3.26 billion years ago. According to their calculations, this space rock was 200 times bigger than the one that wiped out the dinosaurs, triggering a tsunami that mixed up the ocean and flushed debris from the land. With the newly available organic material, bacteria and other organisms flourished.