Science
About how often does Halley's Comet return?
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The definition of "clouds composed of small particles, mostly ice crystals" best fits which science term?
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Where is the observatory where Percival Lowell first theorized the existence of Pluto?
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Which of these is a unit of length used in marine navigation?
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What is the study of stars, planets and galaxies called?
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What is the proper name for a "sundog", or an atmospheric optical phenomenon?
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