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MrMojorisin521 t1_iu9jtmb wrote

Reply to comment by Aseyhe in Is dark matter orbiting galaxies with the same speed as normal matter? by taracus

>In contrast, dark matter has no coherent motion, instead moving in random directions with a wide spread of speeds.

You have a source for this? I didn’t know that we had this much knowledge of dark matter. I’m fascinated.

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Aseyhe t1_iua2p69 wrote

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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