redshift -
(astronomy) a shift in the spectra of very distant galaxies toward longer wavelengths (toward the red end of the spectrum); generally interpreted as evidence that the universe is expanding
propagation the spreading of something (a belief or practice) into new regions
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Wiktionary
Substantiv
redshift -
A change in the wavelength of light, in which the wavelength is longer than when it was emitted at the source.
redshift -
The statistical bias towards Republican or Blue Dog candidates of US federal elections whose reported results vary considerably from those indicated by voter exit polls.
Wikipedia
Redshift happens when light seen coming from an object is proportionally shifted to appear more red. Here, the term "redder" refers to what happens when visible light is shifted toward the red end of the visible spectrum. More generally, where an observer detects electromagnetic radiation outside the visible spectrum, "redder" amounts to a technical shorthand for "increase in electromagnetic wavelength" — which also implies lower frequency and photon energy in accord with, respectively, the wave and quantum theories of light.
