... More asteroids could have made life's ingredients . Scientists reported the discovery of an excess of the left-handed form of a common Earth amino acid in samples of meteorites that came from carbon-rich asteroids. ... A wider range of asteroids were capable of creating the kind of amino acids used by life on Earth, according to new NASA research. ... This suggests that perhaps left-handed life got its start in space, where conditions in asteroids favored the creation of left-handed amino acids. ...