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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​

User Michel Billaud
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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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User Katbyte
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