Definition of redshift in English:


Pronunciation /ˈredˈSHift/ /ˈrɛdˈʃɪft/


  • The displacement of spectral lines toward longer wavelengths (the red end of the spectrum) in radiation from distant galaxies and celestial objects. This is interpreted as a Doppler shift that is proportional to the velocity of recession and thus to distance.

    Compare with blueshift

    ‘In 1929 Edwin Hubble's systematic observations of other galaxies confirmed the red shift.’
    • ‘This effect is known as the gravitational red shift.’
    • ‘This red shift should result in different relative emissions at different wavelengths.’
    • ‘Most cosmologists - with the interesting exception of Hubble himself - came to the immediate conclusion that the red shift could only mean that the universe was expanding.’
    • ‘Does a red shift really mean an expanding universe?’