If you remember Comet Lovejoy in December 2011 across the Southern Hemisphere, then you will know just how bright comet ISON will be. Comet ISON comes at the end of this year and is larger than thought.
Comet Lovejoy (pictured in this article) had a nucleus of around 0.5 km. Comet ISON’s nucleus is estimated to be around 5km, or just a bit smaller than Halley’s Comet. This is 10 times the size of Comet Lovejoy, and Lovejoy was one of the brightest comets in many years for the section of the world. It was dubbed “The Great Christmas Comet of 2011″.