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What is an event horizon?
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What are the different types of galaxies?
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What is redshift?
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What is cosmic microwave background radiation?
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What is the observable universe?
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What is the Hubble Space Telescope?
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What are exoplanets?
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What is a light-year?
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What is the speed of light?
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What is a supernova?
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How do stars form?
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What is the Milky Way?
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What is dark energy?
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What is dark matter?
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