[/caption] NASA scientists studying the comet samples returned by the Stardust spacecraft have discovered glycine, a fundamental building block of life. Stardust captured the samples from comet Wild 2 in 2004 and returned them to Earth in 2006. “Glycine is an amino acid used by living organisms to make proteins, and this is the first … Continue reading "Amino Acid Found in Stardust Comet Sample"