In this video segment adapted from NOVA, learn how comets could have delivered important building blocks for life—amino acids—to Earth billions of years ago. Watch video that features real satellite imagery as well as simulations to see how scientists are learning more about the chemical makeup of comets and the early solar system. Learn about NASA's Stardust mission, which brought samples of comet dust back to Earth in 2006 and led to a major find for astrobiology—the discovery of the amino acid glycine in comet material.

This video is available in both English and Spanish audio, along with corresponding closed captions.