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Astroboffins trace mysterious noise from hard rock in space

Cuddles Silver badge

"The radiation must represent a loss of energy so their spin should slow. Is there a mechanism to spin them up again?"

They seem to be mainly in protoplanetary discs, so the source of energy will be gravity - as the disc contracts gravitational potential energy is converted into kinetic energy, and some of this can be converted into spin (still kinetic energy, but individual rotation rather than bulk movement) through collisions.

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