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Full Idea
Whatever dark matter is made of, it must have mass to feel and generate gravity; but no electric charge, so it does not interact with light. The leading candidate has been the weakly interacting massive particle (WIMP), much heavier than a proton.
Gist of Idea
Dark matter must have mass, to produce gravity, and no electric charge, to not reflect light
Source
New Scientist writers (Why the Universe Exists [2017], 08)
Book Ref
New Scientist writers: 'Why the Universe Exists' [John Murray 2017], p.150
A Reaction
Note that it must 'generate' gravity. The idea of a law of gravity which is externally imposed on matter is long dead. Heavy WIMPs have not yet been detected.
16420 | 84.5 percent of the universe is made of dark matter [New Sci.] |
21174 | Dark matter must have mass, to produce gravity, and no electric charge, to not reflect light [New Sci.] |
21193 | The universe is 68% dark energy, 27% dark matter, 5% regular matter [Hesketh] |