Verschleisen Photonen? Ein Astrophysiker erklärt die Fähigkeit des Lichts, große kosmische Entfernungen zu bewegen, ohne Energie zu verlieren
https://theconversation.com/do-photons-wear-out-an-astrophysicist-explains-lights-ability-to-travel-vast-cosmic-distances-without-losing-energy-252880
5 Kommentare
Uh…..no. Do electrons wear out?
Next question!
Does light really travel ‚cosmic distances‘? I mean, considering length contraction?
or
If photons experience no time or distance due to traveling at light speed, can we really say they ‚travel‘ across the universe – or is that just our perspective?
– Oh, never mind – that’s what the article is about. 🙂
They do lose energy due to Hubble expansion as they travel, downshifting from higher frequencies like ultraviolet to lower like infrared. AKA redshift.
Veritasium just did a very good video on energy conservation, highly reccommend
Cepheid variable stars help us determine the distance of galaxies because we know the intrinsic brightness of those objects, then we measure the apparent brightness to come up with the distance. The implication is that Cepheid variable stars, and all objects, lose apparent brightness over long distances. Is that because they lose energy due to loss of energy, or is it because of that photon’s interaction with intergalactic space?