Throughout the universe, new stars are born in cold, concentrated, asymmetrical clouds of interstellar gas where molecules exist in appreciable abundance. These molecular clouds are often so dark and full of dust that light cannot pass through them, and when they collapse internally, new stars are formed. The motions of such clouds are governed by turbulence and gravity, and they can be tremendously large. Within our own galaxy, where are clouds of molecular gasses predominantly located? Discuss