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Meteorites reveal startling assortments of such prebiotic compounds. So it's possible that asteroids and comets delivered the ingredients for life billions of years ago. And a new study shows that asteroids weren't just passive couriers of organic material.
Researchers analyzed four fragments of the Tagish Lake meteorite, which broke apart over northwest Canada in 2000. They found a rich assortment of organic compounds, as well as great variation among the specimens. One piece of the meteorite had more than 100 times the amount of amino acids as another piece.