Seeing red
A galaxy’s absorption lines are shifted towards the red end of the spectrum because of the expansion of the Universe. The greater the distance, the larger the redshift.
Credit:Volker Gaibler/HITS, SDSS, ESO
A galaxy’s absorption lines are shifted towards the red end of the spectrum because of the expansion of the Universe. The greater the distance, the larger the redshift.
Credit:Volker Gaibler/HITS, SDSS, ESO
