Answers edited by Alexander W. Smith
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What features of an alien planet would you look for in order to determine if the planet experiences plate tectonics?
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What are the different galaxies in space?
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What is the proof for existence of black holes?
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How do the sun, stars and galaxies work together?
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Why do massive stars die?
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Who were the little rock nine ?
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How many galaxies do astronomers estimate there are in the Universe?
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How long ago was the world created?
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Which way does the earth rotate: east or west?