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Unformatted text preview: The galaxies Star populations Population I and II stars Unique differences Formation of a galaxy Explain how the cluster turn-off point reveals age Formation Page 1 of 2 SCI151r2 SCI 151 Astronomy Spiral arms Measuring star distances and period luminosity relationship Other galaxies Types Unusual galaxies, such as quasars Structure of universe Clusters and superclusters Look back in time Steady state – constant creation Big Bang – one creation The origin of the universe Recession of the galaxies Red shift Hubble’s law Origin of universe theories Look back in time Steady state – constant creation Big Bang – one creation Big Bang evidence Microwave background radiation Cosmic nucleosynthesis ratio of hydrogen to helium Quasars as young galaxies Page 2 of 2 SCI151r2...
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