Someone told me that if earth was a black hole it would be the size of an apple, if matter can be squeesed down to this point than what is every thing that we interact with every thing around us, empty space? I was thinking, there is space around earth, inside earth, around my house, inside my house, around this apple, inside this apple, space around those atoms in this apple, space inside those atoms, space around those particles inside those atoms. so space is around and inn every thing. is there a point where space don't pass or does space divide every thing? what is the physical part of the universe and what is the difference between matter, energy and space? for some of you this question maybe obvious but i'm having trouble comprehending it.