Key Component of Earth Life Found in Comet
By Harry Kimball,  Newser Staff
Posted Aug 18, 2009 2:47 PM CDT
Comet Lulin streaks across the early morning sky.   (AP Photo)
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(Newser) – An amino acid necessary to the construction of proteins, and therefore life on Earth, has been found in a comet that passes through our solar system, reports. Glycine was found in samples picked up by a NASA spacecraft in 2004. The discovery suggests that life’s building blocks could have been “delivered to Earth long ago by meteorite and comet impacts,” a researcher says.