Jisho

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せきほうへんい 赤方偏移
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Noun
1. red shift; redshift​Physics, See also 青方偏移
Wikipedia definition
2. Redshift​In physics, redshift happens when light seen coming from an object that is moving away is proportionally increased in wavelength, or shifted to the red end of the 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.
Read “Redshift” on English Wikipedia
Read “赤方偏移” on Japanese Wikipedia
Read “Redshift” on DBpedia
Other forms
赤方変位 【せきほうへんい】
Notes
赤方変位: Rarely-used kanji form.

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