Determine distances to stars and galaxies
Describe at least four techniques used by astronomers to determine distances to stars and galaxies. Make sure you include the scientific theory behind each method and the range over which each method is considered valid.
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The human population has lived a rural lifestyle through most of history. The world's population, however, is quickly becoming urbanized as people migrate to the cities.
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Explain at least four methods used by astronomers to find out distances to stars and galaxies. Make sure you include the scientific theory behind each method and the range over which each technique is considered valid.
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There is an organizational structure to the universe which exists at a level higher than that of the galaxy. Explain this structure?
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Question: Which of the following presents a risk that should involve direct oversight from the DNS?