red shift
- Noun:
- A cosmological phenomenon: "Red shift" refers to the observed shift of light from distant galaxies toward longer wavelengths, specifically the red end of the electromagnetic spectrum. This is a key piece of observational evidence in astronomy indicating that these galaxies are moving away from us, supporting the theory of an expanding universe.
- Noun:
- The astronomer measured the red shift of the distant quasar.
- The greater the red shift, the faster the galaxy is receding and the farther away it is.
"Cosmological red shift": The red shift caused by the expansion of space itself, as opposed to the Doppler effect from motion through space.
- The cosmological red shift is a direct consequence of the stretching of spacetime.
"Gravitational red shift": A shift toward longer wavelengths caused by a strong gravitational field, a prediction of Einstein's general theory of relativity. (Note: This is a related but distinct phenomenon from the primary cosmological meaning).
- The gravitational red shift of light escaping a black hole is extreme.
Redshift (n): A common alternative spelling as a single word.
- The data confirmed a high redshift for the galaxy.
Blueshift (n): The opposite phenomenon, a shift toward shorter (blue) wavelengths, indicating an object is moving toward the observer.
- The star exhibited a slight blueshift, showing it is moving closer to our solar system.
- Doppler shift (toward the red): Specifically refers to the wavelength change due to relative motion away from the observer. (Note: Cosmological red shift is analogous to, but fundamentally distinct from, a Doppler shift).
Hubble's Law: The observational correlation that a galaxy's recessional velocity (indicated by its red shift) is proportional to its distance.
- Hubble's Law is formulated using measurements of galactic red shifts.
Recessional velocity: The speed at which a celestial object moves away from an observer, calculated from its red shift.
- The red shift was used to compute the galaxy's recessional velocity.
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(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
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