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27. Natural Reality / D. Cosmology / 8. Dark Matter

[unknown matter that restrains cosmic expansion]

3 ideas
84.5 percent of the universe is made of dark matter [New Sci.]
Dark matter must have mass, to produce gravity, and no electric charge, to not reflect light [New Sci.]
The universe is 68% dark energy, 27% dark matter, 5% regular matter [Hesketh]