Comet 17/P Holmes

"""... An article in New Scientist tells us that Comet Holmes has brightened by a factor of a million in 24 hours and according to David Morrison, senior scientist at the NASA Astrobiology Institute in Moffett Field, California, “This is equivalent to the planet Saturn suddenly becoming as bright as the Full Moon. ...” """

http://www.americanchronicle.com/articles/viewArticle.asp?articleID=41508