Answer: redshift

AnswerCrossword Clue
REDSHIFTKremlin dress?
REDSHIFTApparent change in a star's color
REDSHIFTSpectral move by Cornell eleven
redshifta displacement of the spectrum of a celestial body
redshiftshift toward longer wavelengths of the spectral lines emitted by a celestial object that is caused by the object moving away from the earth