Question

what is dark matter? explain deeply
and things composed of that​

Answer 1

Answer:

non luminous material that is postulated to exist in space it is area of research today you can read a article about this it is one of the unsolved question of physics.

Answer 2

Answer:

Dark matter can refer to any substance which interacts predominantly via gravity with visible matter (e.g., stars and planets). Hence in principle it need not be composed of a new type of fundamental particle but could, at least in part, be made up of standard baryonic matter, such as protons or neutrons.