Recently NASA scientists discovered glycine, a fundamental building block for life, in samples of Comet Wild 2 collected by the Stardust spacecraft:
"Glycine is an amino acid used by living organisms to make proteins, and this is the first time an amino acid has been found in a comet," said Jamie Elsila of NASA's Goddard Space Flight Center in Greenbelt, Maryland. "Our discovery supports the theory that some of life's ingredients formed in space and were delivered to Earth long ago by meteorite and comet impacts."This find adds to the growing body of evidence that the building blocks for life are common in the universe.
"Life's Building Block Discovered in a Comet." News. Astronomy. 18 Aug. 2009. Web. 2 Sept. 2009. <http://www.astronomy.com/asy/default.aspx?c=a&id=8562>
Image credit: NASA