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April 30 2013

Did Asteroid Impacts Spark Life's 'Left-Handed' Molecules?


The mysterious bias of life on Earth toward molecules that skew one way and not the other could be due to how light shines in star- and planet-forming clouds, researchers say.

If correct, these findings suggest the molecules of life on Earth may initially have come from elsewhere in the cosmos, scientists added.

The organic molecules that form the basis of life on Earth are often chiral, meaning they come in two forms that are mirror images, much as right and left hands appear identical but are reversed versions of each other.

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