Astrochemical model digs into the universe's missing sulfur

Sulfur is one of the most abundant elements in the universe. If you peer into a diffuse interstellar cloud, you find loads of it-about the amount expected based on fusion patterns in the stars it was born in. However, if you look at a dense, cold molecular cloud-the kind where those stars actually form-it seems like 99% of the sulfur expected to be there is missing. Scientists have puzzled over this "missing sulfur problem" for decades, though a leading theory is that the element hides i...