Question: what is dark matter

Christopher Phillips answered on 20 Jun 2011:

Dark Matter comes in all shapes and sizes.. it’s not really just ‘one’ thing.
So dark matter could be pretty much anything we can’t see in the universe such as dim planets, asteroids, dark clouds of matter. Sometimes we have ‘exotic’ dark matter.. this stuff is the really weird stuff. It is made up of small particles kind of like the particles in the atom (electrons, protons and neutrons), except the dark matter is a lot stranger. This is the really weird stuff as it is very hard to detect and we don’t really understand how it works.. yet 😉 It could determine the fate of the universe!