The moment of truth has finally arrived for Comet ISON. It is slated to skim just within 684,000 miles (1.1 million kilometers) above the surface of the sun today (Nov. 28) in a cosmic maneuver that skywatchers and scientists alike have been anticipating since the comet’s discovery in September 2012. The solar passage could destroy Comet ISON, or make it brighter than ever. We will know soon!

(Image Credit: Waldemar Skorupa from Kahler Asten, Germany)

Not strictly true - this’ll only happen if the comet survives its close encounter with the Sun with enough volatiles intact to make a nice tail by the time it’s close to Earth, which isn’t guaranteed.

If it does survive, though, this is going to be the comet of the century, outshining the full moon at night and possibly visible during the day.

It turns out that a nucleus-free dust cloud of comet ISON survived encounter with the Sun!

With a comet like this you just have to wait and see what will happen. It held together a long time, got very bright last night, faded this morning, then apparently fell apart. Still, there’s more observing to do, and of course much data over which to go through.
(Source. The last post on ISON here)