11ac1064_ions___Astronomy___Black_Holes__Question
[Date Answered] May 3, 2010 [Questioner (age, location)] Narayanan (India) [Answer] Black Holes may form as the result of the collapse of a very massive star at its death. All the matter of the star's core is crushed to an infinitely small point, a singularity. Now, although it is true that mass can't be destroyed, it can be transform into energy (that's the meaning of the famous equation E = mc2). Black holes may be an important source of gravitational waves, and may also be important for helping other stars to form. For example the gravity of black holes (like other large stellar objects) may promote nebulae to form stars. [Question] 
Black hole absorbs everything into it.Mass cannot be destroyed.So where do it go?Why don't we think of a star evolving from a black hole?
Quickie Questions - Astronomy - Black Holes