About 4.1 billion years ago, our solar system was a huge cluster of comets bombarding every planet orbiting the Sun and crashing into each other. That period of chaos is known as the
Late Heavy Bombardment, and astronomers believe it was
key to the formation of life in our planet.
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Source: http://feeds.gawker.com/~r/gizmodo/full/~3/4mWKbdpksmU/nasa-image-shows-the-mayhem-that-created-life-on-earth
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