11ac1064_ions___Astronomy___Black_Holes__Question
[Date Answered] March 1, 2007 [Questioner (age, location)] karthick (india) [Answer] Black Holes are theoretical objects. A black hole is an object which has such high gravitational pull that not even light can escape. Hence it is black (which makes it pretty hard to observe directly). Black Holes may form as the result of the collapse of a very massive star at its death. More detailed information at our web page Black Holes. [Question] 
what is black hole?what is the range of its gravity?what is the age of the star which can turn into a black hole?
Quickie Questions - Astronomy - Black Holes