Did a quick search to read a bit more about it, here's what I looked through.
What astronomers do know, according to Dundee, include:
Comet ISON will cross the orbit of Mars on Oct. 1. By then, we will have a good idea of how bright it will get, according to Dundee.
By Nov. 1, ISON might be bright enough to see in small telescopes and perhaps binoculars. It will be a predawn object low in the east.
Nov. 27, it will pass within 700,000 miles of the surface of the sun. At that point, temperatures will increase to about 5,800 degrees, hot enough to melt steel. (Remember comets are basically a snow ball of frozen gas).
If the comet survives its encounter with the sun, we may be treated to a beautiful comet in mid-December. The best views would be before dawn in the eastern sky.
But ISON might fizzle, be dim or be destroyed when it encounters the sun.
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Extra link:
News24