Some of the most powerful explosions in the Universe are gamma-ray bursts, capable of blasting a beam of death half way across the galaxy. In just the last few years astronomers have discovered a tremendous amount about these blasts and what's actually causing them. The answer, of course, is that it's more complicated than we originally thought.

The old Gamma-Ray bursts show:

http://www.astronomycast.com/2007/05/episode-36-gamma-ray-bursts/