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redshift vs. blueshift

redshift

[ red-shift ]
noun
  1. a shift toward longer wavelengths of the spectral lines emitted by a celestial object that is caused by the object moving away from the earth.

blueshift

[ bloo-shift ]
noun
  1. a shift toward shorter wavelengths of the spectral lines of a celestial object, caused by the motion of the object toward the observer.

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