Science
Where is the observatory where Percival Lowell first theorized the existence of Pluto?
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How often does sunspot activity reach its lowest point?
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If you are caught in a sudden heavy rainfall of a showery nature, you are caught in a what?
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What does a reflecting telescope use to bend light?
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Which of the following people is not recognized as developing family therapy?
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Which is the planet with the greatest average density?
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What fraction of Earth's gravity is the Moon's gravity?
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Who discovered the supernova and was the first to theorize that stars "die"?
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