Relativity and gravitational theory Relativistic cosmology Concept
Cosmological redshift
Summary
Cosmological redshift is the stretching of the wavelength of light that travels through an expanding universe. In a Friedmann–Lemaître–Robertson–Walker model, wavelengths grow in proportion to the scale factor. So the redshift of a source measures how much the universe has expanded since the light left it. It is the main observable of cosmology. It differs from both the relativistic Doppler effect and gravitational redshift.
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About this page
| Tag | 8K69WPX4GS |
|---|---|
| URI | m2://8K69WPX4GS |
| Kind | concept |
| Writing | W0 stub |
| MSC | 83F05 |
| Changed | 3 November 2026 |
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Used by
- Hubble's law
- Recombination
- Tolman surface brightness test
- Distance measures in cosmology
- Olbers' paradox