Huge Cosmic Explosions Are Dark and Mysterious

[mickw]

Some of the most powerful explosions in the universe are invisible. But astronomers are a sneaky bunch. By monitoring X-rays and gamma rays, they're able to see what's going on.

Today astronomers said that a certain type of gamma-ray burst, the most energetic explosions in the universe, can light up areas of galaxies, but only in these more energetic wavelengths of the electromagnetic spectrum, revealing intense star formation and death

More:   http://www.space.com/scienceastronomy/090608-aas-dark-grbs.html