it makes a hole in the space time that we call singularity. What happens at the singularity? Who knows! Chateau: Are we able to measure or calculate black holes' effects on dark matter? riyanatarajan: Once matter crosses the event horizon of a black hole, its immaterial (note pun here!) whether it was ordinary atoms or exotic dark matter! We do not keith2000: Is it possible to send a sattelite into a black hole and still have it be able to send and recieve signals? Kevin: No, once a probe passes the event horizon of the black hole, it's gone and can never communicate with us again. riyanatarajan: continuing from earlier..... Jason (moderator): Since black holes inspire everyones imagination and raise lots of questions in relation to things like 2012, read our frequently asked questions and learn more about 2012: http://www.nasa.gov/topics/earth/feature\\... natasha_qurban: what is supernova ? is it a type of black hole.(i know that its a stupid question but its my curiosity. i am the student of 9th grade and wants to be an astronaut.) Kevin: A supernova is the fiery death of a massive star (much more massive than our sun). Black holes can be born in such a supernova. DavPal: Is it possible to exist 'White Holes' from where matter (and light) would be expelled? Ezequiel: You can think of the Big Bang at the ultimate White hole... By definition, a white hole cannot be created, so the only why to have it is if the Universe "comes"