This may sound very silly and a tad bit hard for me to explain, but here goes! I have experienced and seen how when a lit fire was covered with a container, the oxygen begins to dissipate and it begins to suck things into the space. (I did not light myself on fire!) So I was wondering if the black hole worked the same way as that, but on a larger scale! Because it seems to always happen when the star is about to die, which i presumed that the hydrogen (not exactly sure) was about to be burned out. And space is acting somewhat like a container since it is a vacuum, which causes the dead star to eventually collapse on itself. On that note, I have also read from another thread that apparently a black hole stops at some point. If that is true what would you find at the center of the black hole? would it just be a tiny dense matter? or would it just come spilling out(I would assume they would not be physically the same shape anymore)?