what does a black hole consist of?

Question: what does a black hole consist of?
- Keywords:
  black hole
Asked by Bethany to Peter on 9 Nov 2016. This question was also asked by fluffy unicorn.
- Peter Boorman answered on 9 Nov 2016:
  
  Another great question, Bethany!
  
  Scientists aren’t sure what’s inside a black hole as even light can’t escape the closest regions to a black hole. This is because the gravitational pull is so large!
  
  Peter

Question: what does a black hole consist of?