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Originally Posted by ratchetmouth
Nereid said, "'hot dark matter' ('dark matter' which is, or was, moving at relativistic speeds; neutrinos are an example)"
I was under the impression that neutrinos have mass, is that correct?
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Maybe, maybe not. The latest data
strongly indicate that (at least) two of the three "flavors" of neutrinos may have mass.
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(and do we know how much mass? As much as an electron? Less?)
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Very much less. Data so far only set upper limits and these limits are a very small fraction of the mass of an electron.
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Assuming that they do have mass, I must infer that by "relativistic speeds" you mean speeds approaching, but not reaching, c. Is that correct?
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Yes.