Image source: Super Star
(a) a star showing a sudden large increase in brightness and then slowly returning to its original state over a few months
(b) An award-winning PBS show on science
(c) Latin word, feminine of "novus", meaning new
(d) all of the above
If you picked (d), you are correct! Now celebrate by rockin' out to Liz Phair's Supernova (which is star that suddenly increases greatly in brightness because of a catastrophic explosion that ejects most of its mass. Ouch!)
What? You were hoping for Oasis's Champagne Supernova instead? Dude! Say it ain't so!