Later attempts to make tired light work. None matched supernova time-dilation data.
Modern Tired Light Revivals
Plasma and electron-photon interaction proposals attempting to revive tired light against modern data.
Looping ambient scene for Tired Light. Fritz Zwicky proposed in 1929 that the observed galaxy redshifts might be explained if photons lose energy as they travel through intergalactic space, rather than because galaxies are receding in an expanding universe. The hypothesis was a serious alternative when cosmology was young and the physics of intergalactic space was poorly understood. Multiple independent observations from the 1990s onward have decisively ruled out tired light as a viable cosmology.
§1 · The claim, in one sentence
Modern attempts by Paul Marmet, Lyndon Ashmore, and others have proposed specific plasma-based or electron-scattering tired-light mechanisms, but none has matched the combined surface-brightness, time-dilation, and CMB constraints.
Why this was rejected
- ▸FRB measurements of intergalactic electron column densities rule out Marmet's plasma tired-light model.
- ▸Modern revivals have not been published in major peer-reviewed cosmology journals.
- ▸Mainstream cosmologists treat the framework as definitively refuted; the original Zwicky 1929 hypothesis was a serious attempt for its era, but no modern variant fits combined observational constraints.
§2 · Why it might be true
Despite being largely rejected by mainstream cosmology, tired light has had revival attempts in fringe circles. Paul Marmet proposed plasma-based tired-light mechanisms where photons lose energy interacting with electrons, arguing this could produce redshift without excessive scattering. Lyndon Ashmore's book 'Tired Light: an explanation of redshifts in a static universe' presented a coordinated case revisiting surface brightness and CMB arguments.
Various online and self-published papers attempt to tweak tired light to avoid blurring and fit modern data, but these lack peer-reviewed support and do not quantitatively match CMB anisotropies, BAO, or supernova time dilation. Modern analyses using fast radio bursts (which probe electron column densities) show that the densities required by Marmet's model are inconsistent with observations.
The family stance
There is no Big Bang and no cosmic expansion. Cosmological redshift is photon energy loss in a static universe.
§2.5 · Evidence
- Maintains a serious empirical alternative in some popular circles, even without professional support
§3 · What you'd need to test it
- Modified tired-light spectra in electron-photon interactions that could in principle be measured in plasma columns
- Static universe surface brightness scaling distinct from expansion-based predictions
§4 · Where it breaks
- Fast radio burst observations constrain intergalactic electron columns inconsistently with Marmet's model
- No revival has reproduced both Tolman surface brightness scaling and SN Ia time dilation simultaneously
- Has not been integrated into a quantitative cosmological model fitting CMB, BAO, and SNe together
Go deeper
The modern revivals try to supply the mechanism Zwicky lacked while evading his blurring problem. Marmet proposed that photons lose small energy fractions in near-forward, low-angle interactions with free electrons in the intergalactic medium, tuned so the cumulative redshift accumulates without large-angle scattering, while Ashmore's version posits a fixed energy loss per electron encountered, which makes the redshift scale with the electron column density along the line of sight (Marmet, various; Ashmore 2015).
The kinematics do not cooperate. An interaction that removes photon energy must also impart momentum, so energy loss without measurable angular deflection over cosmological path lengths is not physically self-consistent. Fast radio burst dispersion measures now constrain the intergalactic electron column directly, and the densities these models require are inconsistent with those measurements. No revival reproduces both the Tolman surface-brightness scaling and the one-plus-z supernova time dilation at once, let alone the cosmic microwave background, and the work is largely self-published rather than peer-reviewed. The standing is rejected.
▸§5 · Who built it, and when(2 sources, 2 debated)
- DebatedMarmet (various, 1990s-2010s). 'Plasma tired-light papers.'
- DebatedAshmore (2015). 'Tired Light: an explanation of redshifts in a static universe.' Booktower Publishing
Variants in this family
Compare variantsUp next
Spotted an error? Have a source to add?
Prefer email?
You can also send a prefilled email with the variant URL already filled in.