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" ... But looking inside these elliptical galaxies, at the stars inside, can provide a tremendous clue. Whenever we take in the light from a galaxy, we can break it up into its various wavelengths. Rather than perform spectroscopy, which can be too granular for these purposes, we can examine these galaxies by looking at them photometrically. That basically takes all of the starlight from the galaxy, and asks questions like: ... "