A decrease in wavelength and increase in frequency of electromagnetic radiation from an object moving toward the observer. This is the opposite of redshift. When a star or galaxy moves toward Earth, its light shifts toward the blue end of the spectrum.
An increase in wavelength of radiation from an object moving away from the observer. The redshift of distant galaxies pr...
The change in frequency or wavelength of a wave relative to an observer moving relative to the source. In astronomy, it ...
The study of the interaction between matter and electromagnetic radiation. In astronomy, it reveals composition, tempera...
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