11ac1064_ions___Astronomy___Black_Holes__Question
[Date Answered] July 11, 2007 [Questioner (age, location)] Kim Hale (Minnesota) [Answer] Because due to their incredible gravitational field, almost nothing, including light, can escape from them, and so no radiation can be detected friom them. [Question] 
Why are black holes said to be black?
Quickie Questions - Astronomy - Black Holes