Question: What is inside a black hole?

Helen O'Connor answered on 23 Jun 2011:

I think that at the moment its impossible to get information out of a black hole so we can never really know – but theoretical physicists use what we do already know about the universe to make some guesses about what goes on in a black hole.

One of the ways they describe it is that although black holes suck in matter from anything and everything that gets too close to it, they are still empty (!). The entire mass of a black hole is one tiny, infinitely small point at its centre, called a “singularity”

John Wheeler, who first came up with the words “black hole” has said black holes “teach us that space can be crumpled like a piece of paper into an infinitesimal dot”. I can’t actually get my head around this – I think this is why I am more interested in the human mind, as it kind of makes more sense than space and infinity.

A scientist from one of the physics zones would be able to answer this question much better than me!