On this day in 2004, NASA's spacecraft Stardust collected dust grains from the comet Wild 2, and the cometary material was later revealed to contain the amino acid glycine, an essential building block of life.
What
On this day in 2004, NASA's spacecraft Stardust collected dust grains from the comet Wild 2, and the cometary material was later revealed to contain the amino acid glycine, an essential building block of life.