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I What does cosmological redshift do to light

  1. Apr 22, 2016 #1
    I understand it's definition but i am unsure how it affects light.
    Does it slow light down? (is this even possible?)
    Does it stretch light's wavelength?
    Does it convert light into infrared?
    Does it make light brighter or dimmer?

    hmm. thank you for your kind help!
  2. jcsd
  3. Apr 22, 2016 #2
    This, "Does it stretch light's wavelength?" is correct and it is not just definition it happens. As approaching siren is shriller than the receding one.
  4. Apr 22, 2016 #3
    Is it possible for the cosmo redshift to slow down light?
  5. Apr 22, 2016 #4
    Light's speed cannot be slowed down. It is a fundamental constant of nature. Light travels with a lower speed in other media.
  6. Apr 22, 2016 #5
    That's what I thought too alright thank you so much! have a nice day!
  7. Apr 24, 2016 #6
    redshifting means the wavelengths are stretching and so getting longer.
    It doesn't have anything specifically to do with infra red.
    Visible light in the blue part of spectrum could be redshifted to the yellow region, that is also redshift.
    Stretch it more and it will go through orange then red into infra red, but there's nothing special about that.
    Stretch again and it's into the microwave region, it's all redshift no matter what wavelength is the end result..
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