Did Life on Earth Originate With Comets?

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The traditional thinking is that life on Earth began… on Earth. At some point in our distant past, some mixture of amino acids made the jump from a pool of organic molecules to something more lifelike. But maybe the source of life on Earth came from space, hitching a ride aboard balls of ice and dust: comets. This is the controversial theory proposed by Chandra Wickramasinghe, an astrobiologist at Cardiff University in the United Kingdom.