Hi Arifur!
A singularity is a point with a mass density approaching infinity in the limit. It occurs when all the mass of an object is gravitationally collapsed (under its own weight) to (in the limit) a single point. This happens with some supermassive stars (I think about 38 solar masses or more) at the end of their lives, when nothing (not even neutron degeneracy pressure) can hold them up against their own gravity. That is when a black hole is formed. It is the (approaching) infinite gravitational acceleration of the object that gravitationally attracts everything in its region, including light.
Because an infinite mass density is undefined mathematically, we cannot describe the physical properties of a mass singularity. However, nature "cloaks" the singularity in a black hole, so we do not have to deal with it (this may sound like a bit of a cop out, and it is! :D ). A "naked" singularity (outside a black hole) has not been known to be observed. That may come with development of our physical understanding in years (and decades) to come.
I hope that helps answer some of your questions! Let me know if you want to talk any more about this.
Arifur R.
whats below th e event horizon ? i mean Is there really hole in
blackhole ? or is there any possibility of it? if not then
which things can be there ?
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04/27/17
Arifur R.
04/27/17