Dark Matter in the Universe

Dark matter is stuff that we cannot "see", that is, stuff that either

Dark matter may account for 90% of the mass in the universe, since "luminous" matter only contributes 5% of the critical density. We infer that lots of dark matter exists because the "gravitatational mass", inferred from the motions of objects, is much greater than the "luminous mass", inferred from the light distribution.

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