redshift

Noun
  1. (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 (synset 111533790)
    referred to in: astronomy, uranology - the branch of physics that studies celestial bodies and the universe as a whole
    is a type of: propagation - the movement of a wave through a medium
    same as: red shift

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