Science
The Horsehead Nebula can be found in what constellation?
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Which of these measurements of distance is the longest?
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Who discovered the rotating magnetic field that is the basis of Alternating Current?
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What is the proper name for a "sundog", or an atmospheric optical phenomenon?
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Which of these is defined as "part of the electromagnetic spectrum that contains visible light"?
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The Sun's mass is approximately how many times as great as Earth's?
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