SOLAR SYSTEM

Detailed explanation-1: -Key Concepts and Summary. If an atom is moving toward us when an electron changes orbits and produces a spectral line, we see that line shifted slightly toward the blue of its normal wavelength in a spectrum. If the atom is moving away, we see the line shifted toward the red.

Detailed explanation-2: -When they are moving relative to each other, the lines will appear shifted. For example, if a star is moving toward us, its lines will be observed at shorter wavelengths, which is called “blueshifted". If the star is moving away from us, the lines will appear at longer wavelengths, which is called “redshifted".

Detailed explanation-3: -Bottom line: A redshift reveals how an object in space (star/planet/galaxy) is moving compared to us. It lets astronomers measure a distance for the most distant (and therefore oldest) objects in our universe.

Detailed explanation-4: -Astronomers also use redshift to measure approximate distances to very distant galaxies. The more distant an object, the more it will be redshifted. Some very distant objects may emit energy in the ultraviolet or even higher energy wavelengths.