14-1 When galaxies were first discovered, it was not clear that they lie far beyond the Milky Way until their variable stars were carefully observed
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14-2 Hubble devised a system for classifying galaxies according to their appearance
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14-3 Exploding stars release similar amounts of light and their distance can be inferred by measuring their apparent brightness
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14-4 Galaxies are found in clusters and superclusters
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14-5 Colliding galaxies produce starbursts, spiral arms, and other spectacular phenomena
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14-6 Dark matter can be inferred by observing the motions of galaxy clusters
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14-7 Quasars are the ultraluminous centers of the most distant galaxies
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14-8 Supermassive black holes may be the âcentral enginesâ that power active galaxies
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14-9 Galaxies may have formed from the merger of smaller objects
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DLAP questions | slater2e_ch14_10_dlap.xml | 53922ac3757a2e0a43000001 |
DLAP questions | slater2e_ch14_11_dlap.xml | 53922ac3757a2e0a43000001 |
DLAP questions | slater2e_ch14_12_dlap.xml | 53922ac3757a2e0a43000001 |
DLAP questions | slater2e_ch14_13_dlap.xml | 53922ac3757a2e0a43000001 |