Submitted by taracus t3_ygfptx in askscience
Aseyhe t1_iu98er6 wrote
Reply to comment by gnorty in Is dark matter orbiting galaxies with the same speed as normal matter? by taracus
It can be radiated away as light.
Collisions involving molecules can excite vibrational or rotational modes, which is probably what you are getting at. Such modes gradually decay by emitting light. Collisions could also excite electronic states, which also later decay by emitting light.
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