Question

What is dark Matter ???

Answer 1

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━━━━━━━━━━━━━━━━━━━$\mathfrak{\green{Answer.}}$(in some cosmological theories) non-luminous material which is postulated to exist in space and which could take either of two forms: weakly interacting particles ( cold dark matter ) or high-energy randomly moving particles created soon after the Big Bang ( hot dark matter ).
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Answer 2

dark matter is a hypothetical form of matter that is thought to account for approximately 85% of the matter in the universe , and about a quarter of its total energy density.