Tired light is a class of hypothetical redshift mechanisms that was proposed as an alternative explanation for the redshift-distance relationship. These models have been proposed as alternatives to the models that require metric expansion of space of which the Big Bang and the Steady State cosmologies are the most famous examples. The concept was first proposed in 1929 by Fritz Zwicky, who suggested that if photons lost energy over time through collisions with other particles in a regular way, the more distant objects would appear redder than more nearby ones. Zwicky himself acknowledged that any sort of scattering of light would blur the images of distant objects more than what is seen. Additionally, the surface brightness of galaxies evolving with time, time dilation of cosmological sources, and a thermal spectrum of the cosmic microwave background have been observed—these effects should not be present if the cosmological redshift was due to any tired light scattering mechanism. Despite periodic re-examination of the concept, tired light has not been supported by observational tests and remains a fringe topic in astrophysics.

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  1. T

    Yung mainit ulo mo...

    Cust: wha what was your name? Me: Tree Cust: what I can't hear you? Me: I'ts Tree Tango Romeo Echo Echo! Customer: You charge me, you just pop up on that site! Me: It's a matter of reading of where signed up Sir! and In my own intellectual understanding our sign up process here is fully manual...
  2. N

    Closed Yung nakakagawa ka ng malatulang dula dahil sa sobrang pagod

    Marahil ay umabot na sila sa pinakasukdulan at hindi na kayang patayin ng sinasabing pahinga ang kapaguran.
  3. T

    Closed Insomia problem + thesis problem

    Hirap mabuhay pero mas mahirap pag walang buhay .
  4. P

    Closed Udp for open vpn

    Wala ba tlgang butas ang udp servers ng openvpn? :(
  5. S


    game and movie addict, curious about latest updates of games and applications