11ac1064_ions___Astronomy___Black_Holes__Question
[Date Answered] July 18, 2007 [Questioner (age, location)] Elric (Iowa) [Answer] The mass of a supermassive black hole is of the order of a billion solar masses at their center. [Question] 
How big is a supermassive black hole?
Quickie Questions - Astronomy - Black Holes