if a black hole falls downward, then there must be a bottom part to space right?

Answer 1

It falls inward upon itself not toward any bottom.

Answer 2

In space there is no up or down. There is only 'in' toward a mass and 'out' away from a mass. Black holes are objects that were extremely massive stars I've read, that when they no longer contained enough nuclear fuel to maintain their form, first fell into themselves, resulting in an explosion called a super nova. If the remains of the star are still massive enough it will then continue falling into itself until it literally bends space around it, going who knows where, and leaving only a singularity, a point in space with so much gravity that even light, (the fastest thing in the known universe) can't go fast enough to get out. That is why it's called a 'black' hole. All we can see of them is something called an event horizon. I'm not real clear on what that is, I think it may be radiation given off by things just as they slip over into the area of no return around the hole and speed up.

Answer 3

I like to think of a black hole as a region of space completely devoid of energy. As energy is reduced the electrons can no longer fly around in orbits and collapse into the proton. By adding a neutrino to this a neutron is formed. This is called a neutron star. Further extracting energy results in the neutron collapsing (into quarks?) and so on until the region of space contains so much mass that the escape velocity exceeds the speed of light. This means that light cannot escape. Your choice of the words "downward" and "bottom" are incorrect. "Inward" and "center" would be the words I would use. As for the bottom part to space, Einstein theorized that space curves in on itself, thus there is no "bottom".