Science
Halley's Comet is predicted to appear again in which year?
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Where on the moon did people first land a spacecraft?
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What is the third brightest object in the Earth's sky?
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What famous scientist introduced the concept of "space-time"?
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The Horsehead Nebula can be found in what constellation?
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What tool do people at sea use to measure distance with echoes?
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What does one call a smaller stream that parallels a larger stream and finally enters the larger stream?
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What form of energy are we using when we use an alarm clock or a dishwasher?
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