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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.
History & Measurement
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redshifts light universe doppler galaxies blueshift gravitational wavelength objects effect stars galaxy motion cosmological energy radiation expansion frequency isbn astronomy
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Redshift | is a | increase in the wavelength | 0.90 | text |
| Redshift | is a | blueshift | 0.90 | text |
| Doppler radar | instance of | and are used in terrestrial technologies | 0.80 | text |
| radar guns | instance of | and are used in terrestrial technologies | 0.80 | text |
| absorption lines | instance of | features in the two spectra | 0.80 | text |
| emission lines | instance of | features in the two spectra | 0.80 | text |
| or other variations in light intensity may be shifted.Redshift | instance of | features in the two spectra | 0.80 | text |
| Barnard's Star are moving toward us | instance of | emitting synchrotron radiation and bremsstrahlung that appears blueshifted.Nearby stars | 0.80 | text |
| resulting in a very small blueshift.Gravitational blueshiftUnlike the relative Doppler blueshift | instance of | emitting synchrotron radiation and bremsstrahlung that appears blueshifted.Nearby stars | 0.80 | text |
| caused by movement of a source towards the observer | instance of | emitting synchrotron radiation and bremsstrahlung that appears blueshifted.Nearby stars | 0.80 | text |
| thus dependent on the received angle of the photon | instance of | emitting synchrotron radiation and bremsstrahlung that appears blueshifted.Nearby stars | 0.80 | text |
| gravitational blueshift is absolute | instance of | emitting synchrotron radiation and bremsstrahlung that appears blueshifted.Nearby stars | 0.80 | text |
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