Question: Hi what is inside a black hole and what exactly is it?

Stefan Lines answered on 14 Nov 2014:

Black Holes are confusing, because of their name. A hole seems to imply something that isn’t there… like an emptiness in space. But it’s completely the opposite. Something absolutely massive (like a star) gets even bigger and collapses in on itself. Suddenly, you have a huge amount of mass in a tiny space. It’s so massive that even light, which is quantised as tiny photon particles, gets pulled in by the strong gravity – and so it appears as a Black Hole. It’s common belief that black hole are worrying because they’ll keep sucking stuff in – but actually they have no more influence that any other normal mass. So stars can orbit around them without getting pulled in. In fact, they release a special type of radiation, called Hawking Radiation, which very slowly reduces their mass until they disappear!