Science
What is defined as the average distance from the Earth to the Sun?
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What university did astronomy and space science theorist Carl Sagan teach at?
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What is a return of the electron beam to the top of a television picture tube?
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What is the central set of female reproductive organs in a flower?
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What dust-like particles are only found on plants like ferns, mosses and mushrooms?
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What is an angle that an airplane's wings make with a horizontal plane called?
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