A cosmic explosion with an energy equivalent to the output of a billion suns went unnoticed by astronomers until they caught ...

Gamma-ray bursts are the universe's most violent flashes — capable of releasing more energy in a fraction of a second than ...

new video loaded: Virgin spaceship 'mid-air explosion' Photos appear to show Virgin's spaceship exploding in mid-air before its deadly crash. Rough cut, no reporter narration. Advertisement ...