Cosmological phenomenon of the lengthening of light's wavelengths, indicating an expanding universe
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Related clues
- Spectral aspect
- Astronomical phenomenon attributable to the Doppler effect that occurs when a light source moves away from an observer
- In astronomy, the displacement of spectral lines towards longer wavelengths, seen as evidence that the universe is expanding
- Phenomenon observed in receding galaxies
- A phenomenon in astrophysics characterised by displacement of spectral lines of distant galaxies toward longer wavelengths as a result of the Doppler effect
Possible answers
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