UPDATE: "Comet ISON may have survived"
As December dawns, the nucleus of Comet ISON (C/2012 S1) should be seething with activity. Just three days removed from its November 28 perihelion — when the comet skimmed within 730,000 miles (1.16 million kilometers) of the Sun’s surface — ISON will be bathed in a sea of solar radiation. The heat will warm the dirty snowball’s surface, causing the ices there to turn directly to gas, or sublimate. The erupting gases will liberate dust particles as well. The amount of gas and dust emitted by ISON will determine how bright it appears in early December.
For complete coverage of Comet ISON, visit www.Astronomy.com/ISON.