If light leaves a galaxy, and runs into a bunch of space dust

>>8487375
No.

>>8487375
>slow down the light
/sci/ is getting more and more retarded these days.

>>8487382
i mean the light could lose energy from running into things

>>8487385
Please google "does light slow down?".

>>8487405
>>slow down the light

Some young woman got media exposure on CNN back in 2001 for her experiment in slowing down light.

http://news.harvard.edu/gazette/story/1999/02/physicists-slow-speed-of-light/

>>8487410
>>8487413
I can't even tell what is shitposting and what is honest retardation anymore.

https://en.wikipedia.org/wiki/Speed_of_light#In_a_medium

>>8487416
. As an extreme example of light "slowing" in matter, two independent teams of physicists claimed to bring light to a "complete standstill" by passing it through a Bose–Einstein condensate of the element rubidium, one team at Harvard University and the Rowland Institute for Science in Cambridge, Mass., and the other at the Harvard–Smithsonian Center for Astrophysics, also in Cambridge. However, the popular description of light being "stopped" in these experiments refers only to light being stored in the excited states of atoms, then re-emitted at an arbitrarily later time, as stimulated by a second laser pulse. During the time it had "stopped," it had ceased to be light. This type of behaviour is generally microscopically true of all transparent media which "slow" the speed of light.[62]

>>8487422
You answered your own question, assuming you are OP.
Light never slows down.
Anyway before I lose even more braincells I am outta here.

>>8487424
that's not OP but I think I have my answer

>>8487375

If increase of wavelength is what you mean, instead of "slow down" - then search for Halton Arp and implications of his Atlas of Peculiar Galaxies.

He had basically the same idea, but got shat on into oblivion.

Priests wear lab-coats nowadays, but the business remains the same.

>>8487375
Blueshift is caused by the gravity of other external universes acting upon our Universe. :^)

>>8487375
the light does not slow down on the normal sense, this implies that it would exits a gaseous nebula at a lower speed and not return to c. Further on this, this would violate many laws of physics. There would be no mechanism to impart energy from the photon without destroying it entirely in the nebula.

And then, most simply you are wrong because the speed of light though most gases is essentially just under the speed of light

>>8487375
If there was a bunch of dust and shit taking energy away from light in intergalactic space, then that dust would in turn have to heat up. If it's at a higher temperature, it would produce a different blackbody spectrum, which is not what we observe.