Science
What piece of polished, cut glass can we use to see the spectrum of visible light?
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What was the name of the first artificial satellite launched into space?
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Awarded the Nobel Prize in 1977, John H. Van Vleck's area of expertise is in what?
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Which is the approximate angle at which the Earth inclines?
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What spacecraft takes astronauts into space, orbits the Earth and can be flown more than once?
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The Sun's mass is approximately how many times as great as Earth's?
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What is the distance between two peaks of a wave called?
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