Submitted by taracus t3_ygfptx in askscience
Aseyhe t1_iua2p69 wrote
Reply to comment by MrMojorisin521 in Is dark matter orbiting galaxies with the same speed as normal matter? by taracus
To be clear, we don't directly measure dark matter velocities; there are several theoretical steps along the chain. See this reply. I'm not sure of a good pedagogical source right now, but here's an academic one (see e.g. section 4).
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