The redshift of galaxies refers to the elongation of their spectral lines towards longer (redder) wavelengths due to the Doppler effect, caused by their motion away from Earth. This phenomenon is a result of the universe’s expansion, with distant galaxies moving away faster, causing greater redshifts. Studying the redshift of galaxies provides crucial information about their distance, velocity, and the expansion rate of the universe, allowing astronomers to map the cosmic web and trace the universe’s evolutionary history.
Come for the Scenery, Stay for the Stars