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The life of a photon
(lemmy.world)
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this post was submitted on 13 Aug 2023
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Eventually all photons will hit something. Even if it's a trillion trillion trillion years in the future when nearly everything in the universe has decayed into irony.
Someone correct me if I'm wrong, but eventually the universe is going to be expanding faster than the speed of light. At that point all interaction ceases, and any photons that didn't get absorbed by something yet never would.
Sort of. The expansion of space causes (and is measured by) redshift. The photon that doesn't get absorbed "exists" until its wavelength is not measurable (as its wavelength approaches infinity).
The cool thing about this is that it is identical to what happens in a black hole. Spaghettification. This also has the fun consequence of us possibly existing inside of a black hole, and black holes themselves are entire universes. Because of the breakdown of physics beyond the event horizon its not exactly easy to confirm or deny this either.
Edit: redshift not redshirt. Startfleet personal aren't dying here, it's photons