... During this next month, however, even besides the fleeting Comet Bradfield, two comets have a slight chance of rivaling Hale-Bopp and a good chance of putting on a memorable sky show. Comet Bradfield Passes the Sun . ... Right now, Comet Bradfield is passing the Sun. ... Astronomers divide stars into different spectral types. ... Deep in the normally hidden recesses of giant molecular cloud DR21, a stellar nursery has been found creating some of the most massive stars yet recorded. ...