AST-099intermediate

Doppler Shift, Redshift & Blueshift: Observation, Measurement & Evidence

The Doppler effect changes the observed wavelength of radiation when a source and observer have relative motion along the line of sight. Doppler measurements reveal radial velocity but not the full three-dimensional velocity by themselves.

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intermediate45 minFact checked

Doppler Shift, Redshift & Blueshift: Observation, Measurement & Evidence

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AST-098Doppler Shift, Redshift & Blueshift: Physical Mechanisms→

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AST-100Doppler Shift, Redshift & Blueshift: Advanced Connections→

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The Doppler effect changes the observed wavelength of radiation when a source and observer have relative motion along the line of sight.

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For ordinary Doppler motion, successive wavefronts arrive more widely spaced when the source recedes and more closely spaced when it approaches.

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