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Free streaming

This article is about a term in astronomy. For other uses, see Freestream (disambiguation).
Diagram with blue circle representing the cosmic microwave background surface which the observer (at centre, at present time) observes at the time of last scattering. The yellow lines describe how photons were scattered before the epoch of recombination and were free-streaming after.

In astronomy, a free streaming particle is one that propagates through a medium without scattering. The particle is often a photon, but it can also refer to neutrinos, cosmic rays, and hypothetical dark matter particles.

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