EarthSky What do redshifts tell astronomers?
By A Mystery Man Writer
Description
Redshifts reveal how an object is moving in space, showing otherwise-invisible planets and the movements of galaxies, and the beginnings of our universe.
If redshift and blueshift are describing how fast a star is getting closer/farther from earth then how come astronomers use it to determine its distance from earth? How is it related?
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