A supernova 400 light years from home has been observed in all it's exploding goodness by Swift, a group of US-British-Italian astronomers who honed in on it's gamma ray bursts.
Supernovae occur when huge, mature stars effectively run out of fuel and collapse in on themselves. The most well known may be the crab nebula created by a supernova in 1054 (which was recorded by Chinese astronomers).
This is not to be confused with Aldo Nova who's career ran it's course and collapsed on itself because life is just a fantasy. Can you live this fantasy life?
And this is certainly not meant to be confused with the latest of billions of reality TV shows that keep American's on their asses glued to a box.