American Heritage® Dictionary of the English Language, Fourth Edition
- n. An increase in the wavelength of radiation emitted by a celestial body as a consequence of the Doppler effect.
- n. astronomy Light spectra shifted towards red, as by elongation of light waves from a source moving away from the detector.
- n. (astronomy) a shift in the spectra of very distant galaxies toward longer wavelengths (toward the red end of the spectrum); generally interpreted as evidence that the universe is expanding
- From the fact that the longer wavelengths of light are at the red end of the visible spectrum. (American Heritage® Dictionary of the English Language, Fourth Edition)
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