11ac1064_ions___Astronomy___Black_Holes__Question
[Date Answered] July 9, 2007 [Questioner (age, location)] DEEPSHIKA (INDIA) [Answer] Black holes are the evolutionary endpoints of stars at least 10 to 15 times as massive as the Sun. And all that mass will end concentrated in a very small (for cosmic standards) region. [Question] 
why do black holes have so much of gravitational force?
Quickie Questions - Astronomy - Black Holes