11ac1064_ions___Astronomy___Black_Holes__Question
[Date Answered] August 15, 2008 [Questioner (age, location)] roli (india) [Answer] Black holes are supposed to exist in the center of galaxies, but be aware that they are theoretical objects! See more in our web page Black Holes. [Question] 
how do you locate a black hole
Quickie Questions - Astronomy - Black Holes