It's not too late to check out the "exploding" comet, 17P/Holmes. Discovered in 1892, the comet grew about half a million times brighter in late October of this year. It's the largest known outburst by a comet.
17P/Holmes is now larger than the sun and visible to the naked eye in the constellation Perseus. Viewed through binoculars or a small telescope, it looks like a fuzzy ball. Sky & Telescope has continuous updates on the comet and how to spot it.—Dawn Stover
Image: John Lanoue