Transcript: Over sixty different types of molecules have been found in interstellar space. Most of them are simple molecules with two or three atoms. However some of them are complex, and they include organic materials that make people very interested in the possibilities of life in deep interstellar space. For example the amino acid glycine, NH2CH2COOH, has been found, and acetone CH3CH3CO, and ethyl alcohol CH3CH2OH. Astronomer Ben Zuckerman calculated that the Sagittarius B2 molecular cloud if cleared of impurities would yield ten to the power twenty-eight fifths of pure alcohol at two hundred proof. However the density of interstellar space is very low. A business man once calculated that a one kilometer wide funnel being dragged at ten times smaller than the velocity of light would take a thousand years to fill a single shot glass of the alcohol that exists in space. The molecules in space are important because they show that complexity can be derived from simple atomic collisions provided the density is sufficiently high.