Question

What is Dark Matter?
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Answer 1

Answer:

Dark matter is a hypothetical form of matter thought to account for approximately 85% of the matter in the universe and about 27% of its total mass–energy density or about 2.241×10−27 kg/m3. ... Most dark matter is thought to be non-baryonic in nature; it may be composed of some as-yet undiscovered subatomic particles.

Answer 2

Here is the answer

Dark matter is a unknown material in space which is the most particle present in space

it a mystery what it is many theory has proposed about it but no one is sure what it is