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出典:『Wikipedia』 (2011/06/03 02:48 UTC 版)

英語による解説

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Tired light is a class of hypothetical redshift mechanisms that was proposed as an alternative explanation for the redshift-distance relationship. Generally, these models are proposed as alternatives to the 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 photons lose energy over time through collisions with other particles. This idea was first criticized because such scattering would blur the images of distant objects more than what is seen and the expected time dilation of cosmological sources has also been observed — and effect that should not be present if the cosmological redshift was due to a tired light scattering mechanism. Today, tired light is remembered mainly for historical interest as an example of a falsified hypothesis.