NASA has confirmed that dust from the ancient asteroid Bennu contains tryptophan, an amino acid tied both to human mood and to the chemistry that makes life possible. The finding folds a familiar ...

Some of the oldest objects in the solar system still drift above your head. Asteroids and comets formed before Earth took shape, and they carry a record of a chemical world that existed long before ...

Tryptophan, the essential amino acid behind the Thanksgiving myth that eating turkey can make you sleepy, has been found to exist on Bennu, a small asteroid that swings by our planet about every six ...