Amino acid glycine...

found in dust particles sampled from comet Wild 2 that was returned to Earth by NASA's Stardust spacecraft. Key bit:

"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 Dr. Jamie Elsila of NASA's Goddard Space Flight Center in Greenbelt, Md. "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."

Wow. This certainly bolsters the view that life - as we know it - may be more common in the universe than thought. I wonder what Fred Hoyle would have thought?