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It is the missing mass of the universe

When we closely observe galaxies,we see galaxies spining too fasting apart but dark matter lets galaxies to oppose moving apart

Doesnt it seem have enough gravity to stop the spining of galaxies apart ?

But in fact the matter also produces certain gravity that you dont see ,this gravity produced by matter is called dark matter

Dark matter is represents the missing mass of the universe in fact truth is that 80 percent mass of universe is not found. with the dark matter 90percent mass of universe could be determined.
shortly it is the gravity produced by the matter that you dont see,it is the missing mass of the universe

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