Astronomers are excited about the discovery because a pair of black holes could yield valuable information about theorized but never directly detected gravitational waves. Gravitational waves are ripples in space-time that exist according to Einstein's theory of general relativity. If the two black holes collide, most of the released energy will be in the form of gravitational waves, literally bending the fabric of space-time.
But for now, the pair of black holes still need to be 100 percent confirmed. When two black holes so far away are close to one another, astronomers on Earth can only see it as a particular flicker of light. Astronomers need to rule the flicker out as a statistical anomaly. Still, in the long history of the universe, black holes have almost certainly collided before. Destroying whole galaxies in one fell swoop is not just science fiction. [New York Times]
source: gizmodo.com by Sarah Zhang