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clusters; and the enhanced clustering of galaxies) that cannot be accounted for by the quantity of observed matter.The ?CDM model proposes specifically cold dark matter, hypothesized as:
* Non-baryonic: Consists of matter other than protons and neutrons (and electrons, by convention, although electrons are not baryons)
* Cold: Its velocity is far less than the speed of light at the epoch of radiation-matter equality (thus neutrinos are excluded, being non-baryonic but not cold)
* Dissipationless:

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