Why astronomers theorize that most of the matter in galaxies and clusters of galaxies is dark matter

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asked Aug 24, 2020 151k views

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Katbyte · Answer 1 · 2020-08-28T23:11:01+0000

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Galaxies are spinning faster than they should based on their observable / measurable mass. ... The gravitational pull of mass and the expansion due to the energy left over from the Big Bang and Dark Energy

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Why astronomers theorize that most of the matter in galaxies and clusters of galaxies is dark matter

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Why astronomers theorize that most of the matter in galaxies and clusters of galaxies is dark matter