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cosmological time dilation

(cosmic time dilation)
(very distant events appear to take longer)

Cosmological time dilation (or cosmic time dilation) is the phenomenon that events observed at cosmological distances (i.e., with a significant redshift) appear to take longer than if they were nearby. The lengthening ratio is (z+1)/z, the same ratio as redshifted wavelengths from the same distance, and the two can be considered the same phenomenon.

Observation of distant events such as supernova light curves do last longer than corresponding nearer events, in proportion to the redshift(s) determined from recognizable spectral lines.


Referenced by:
time dilation