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MENTAL MODEL · M11883

Blue Shift

Blue Shift
TechnicalHigh supportPhysics
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Version 1.0.0 · Updated 2026-07-28

CORE DEFINITION

In physics, a redshift is an increase in the wavelength, or equivalently, a decrease in the frequency, of electromagnetic radiation (such as light). The opposite change, a decrease in wavelength and increase in frequency and energy, is known as a blueshift.

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In physics, a redshift is an increase in the wavelength, or equivalently, a decrease in the frequency, of electromagnetic radiation (such as light). The opposite change, a decrease in wavelength and increase in frequency and energy, is known as a blueshift.

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When a light source moves toward an observer, the observed wavelength shortens and frequency increases (shifts toward the blue end), which is blueshift; it is a manifestation of the Doppler effect.

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    en.wikipedia.orghttps://en.wikipedia.org/wiki/RedshiftZH · Explicit
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