schwit1 writes: The Hubble Space Telescope has spotted the explosion of a star that does not fit into any theory for stellar evolution. "The exploding star, which was seen in the constellation Eridanus, faded over two weeks — much too rapidly to qualify as a supernova. The outburst was also about ten times fainter than most supernovae, explosions that destroy some or all of a star. But it was about 100 times brighter than an ordinary nova, which is a type of surface explosion that leaves a star intact. 'The combination of properties is puzzling,' says Mario Livio, an astrophysicist at the Space Telescope Science Institute in Baltimore, Maryland. 'I thought about a number of possibilities, but each of them fails' to account for all characteristics of the outburst, he adds." We can put this discovery on the bottom of a very long list of similar discoveries by Hubble, which this week is celebrating the 25th anniversary of its launch.