Many of life's building blocks can be found in the objects bombarding Earth from outer space. Does that mean that life, too, developed elsewhere before arriving here?
Mary P. Hrybyk-Keith/NASA
March 10, 2013 Not only is there no consensus yet on how life might have started on Earth, there is not even any agreement on where it started. But still, many think the mystery of life's origin can be solved. Commentator Wim Hordijk revels in the subject at a conference hosted by Princeton University.
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