Shows > X-Ray the Sky: Chandra's Cosmos

'Ultramassive' Black Holes: Bigger Than 'Supermassive' | Video

A new study of the some of the biggest known black holes has concluded with new estimates in size. 10 of the 18 surveyed could be 10 to 40 billion times more massive than our Sun.
credit : NASA/CXC/A. Hobart