https://wiki.naturalphilosophy.org/index.php?action=history&feed=atom&title=Category%3ARedshift 2026-07-21T18:20:39Z Revision history for this page on the wiki MediaWiki 1.43.0 https://wiki.naturalphilosophy.org/index.php?title=Category:Redshift&diff=303245&oldid=prev 2026-07-20T13:44:18Z

<p>Create/expand category description</p> <p><b>New page</b></p><div>This category collects work on &#039;&#039;&#039;redshift&#039;&#039;&#039; — the displacement of spectral lines toward longer wavelengths — and above all on the question of what causes it.<br /> <br /> Almost everything the standard cosmology says about the size, age and history of the universe rests on reading redshift as &#039;&#039;&#039;recession velocity&#039;&#039;&#039;, so this is the single most consequential interpretive question in astronomy. The alternatives argued on this wiki include: &#039;&#039;&#039;intrinsic redshift&#039;&#039;&#039;, where the shift is a property of the source rather than of its motion, the position associated above all with [[Halton Arp]] and his evidence of high-redshift quasars physically associated with low-redshift galaxies; &#039;&#039;&#039;tired light&#039;&#039;&#039;, in which photons lose energy over distance; &#039;&#039;&#039;quantized redshift&#039;&#039;&#039;, the claim that redshift values cluster at preferred intervals in a way that velocity cannot explain; gravitational redshift; and propagation effects in a medium.<br /> <br /> If any of these accounts is right for a substantial fraction of observed shifts, the distance scale and the expansion itself are called into question. See also [[:Category:Big Bang]], [[:Category:Astronomy]] and [[:Category:Cosmology]].<br /> <br /> [[Category:Cosmology]]</div>

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