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MENTAL MODEL · M3724

Redshift

Redshift
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 away from an observer, the light waves are stretched, the frequency decreases, and the spectral lines shift toward the red end. Cosmological redshift is caused by the expansion of space; Hubble's law shows that the greater the distance, the greater the redshift, proving that the universe is expanding. As a metaphor: the 'moving away' of surrounding resources/opportunities may be due to structural expansion of the environment, not targeted at individuals.

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