Question

what is dark matter?​

Answer 1

Explanation:

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

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Answer 2

explanation

Dark matter is a form of matter thought to account njor approximately 85% of the matter in the universe and about a quarter of its total energy density. ... Because dark matter has not yet been observed directly, if it exists, it must barely interact with ordinary baryonic matter and radiation, except through gravity.