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Figure 2. i

Gaiaxy Spectra, Astronomers take the Fight from a galaxy and spread it into a rainbow Then they construct a graph as shown at the cop arn) the bottom,The gaJaxy spectra at the cop of this rainbow have absorption lines, those near the bottom have emission lines that come from gas clouds whose atoms are excited by the ultraviolet light from stars. Courtesy of Barbara Carter. Harvard-Smithsonian Center for Astrophysics

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