Two Supermassive Black Holes on Track to Collide Will Warp Space and Time - CNET

They'll merge in about 10,000 years. One researcher relates the epic discovery of these enormous voids to "a good detective story."

Two Supermassive Black Holes on Track to Collide Will Warp Space and Time     - CNET
They'll merge in about 10,000 years. One researcher relates the epic discovery of these enormous voids to "a good detective story."