Hypernova

A hypernova!? The latest newcomer in the stellar tiergarten:
A nova is an exploded star. A gigantic outbreak of sheer power. A supernova also is an exploded star, but with the light and power of a galaxy. What a supernova is compared to a nova, the hypernova is compared to a supernova.

Read more about it:
NASA news
Astronomy Bizarre

Or... enjoy this beautiful picture, at the entrance of Hypernova, a nice site for hypertext-freaks:
Hypernova

A picture of two suspected hypernova remnants, called MF83 and NGC5471B, located in the nearby spiral galaxy M101.