what is dark matter?

Question

i have a theory that dark matter could be a gravtational pull and why black holes are black and not green purple or yellow and why they can bend light

you got it right

i think that excat same statement
except i think dark energy is in the center and dark matter is in the boundraiy of time only god can open. The universe is a ganit organimsm. Its boundarys are gased dimaonds that are undestrutble. Im confused. Its an unequlley balance bedtween the two

black holes are entracne for worm holes

Answer 1

wow! some people really know their stuff! raymond. but i like to try and disturb. what if dark matter is actually nothing, meaning that it is not even space itself, even space requires a reference point to exist in the first place. no reference point, no space, just nothing. not likely of course, if not quite ludicrous, but a theory nonetheless. and the bending light thing, nature abhors a vacuum. black holes eat material and energy we think, could something swallow space itself? langoliers

Answer 2

Dark matter should be matter (as opposed to a pull).
Dark energy is a push (or a negative pull).

We do not know what dark matter is, except that its presence is needed to explain gravitational pull that keeps galaxies (and galalxy clusters) together.

We can measure the pull. We can, for example, measure the orbital speed of ordinary, visible matter at specific distances from a galaxy's core. Based on that speed, we can calculate the gravitational pull that is needed for that speed and, therefore, the mass that is needed to explain that pull.
We compare that mass with what we actually see as matter in the galaxy. What we see is insufficient to explain the pull. Therefore, there must be more matter than what we can see (hence its name 'dark matter') in order to explain the mass we need to explain the pull.

But we do not know what it is.

If you think that 'dark matter' is, instead, directly a gravitational pull (as opposed to matter causing a pull), then that would be different than generally-accepted gravitation theories that require mass in order to generate gravitational pull.

For example, you could be thinking that we do not need to imagine more mass, since the extra gravity exists without extra mass. There are some theories that are being developed in that way (see MOND -- Modified Newtonian Dynamics).