Amino Acids in Space
amino acids in space
A portion of the Orion Nebula
--------------------------------------------------------------------------------
Amino acids, such as isovaline (illustrated), come in left- and right-handed forms, but almost every living organism on Earth uses left-handed forms. Research published in 2009 suggests that water on asteroids amplified a bias – possibly caused by polarised starlight – towards left-handed amino acids. Illustration: NASA/Mary Pat Hrybyk-Keith
--------------------------------------------------------------------------------
The first detection of an amino acid in space was made in 1994 when glycine was found in a star-forming region about one light-year across within the molecular cloud known as Sagittarius B2. This discovery adds weight to the idea that some important prebiotic chemicals, including amino acids, form on grains of cosmic dust and are later deposited on the surface of young planets during impacts with comets and asteroids (see cosmic collisions, biological effects ).