Science
What university did astronomy and space science theorist Carl Sagan teach at?
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What is condensed water falling from the atmosphere called?
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Which person is known for establishing the laws of motion and gravity?
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What is the opening of a lens, which controls the amount of light?
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Which scientific term is defined as the rate at which a wave oscillates in cycles?
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Which of these measurements would be different on Mars than on Earth?
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Where is the observatory where Percival Lowell first theorized the existence of Pluto?
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