Science
What is the speed of Earth (Sol 3) around its primary (the sun, Sol)?
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What electronic device only allows current to flow in one direction?
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What process produces a duplicate of the original cell?
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Mariner IV sent the first pictures of which planet back to earth?
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What type of lens has a thin middle and makes objects appear smaller?
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Who was the first President of the "Planetary Society", an organization of amateur astronomers?
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If a jet cruises at 575 mph, how far will it go in 12 hours?
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Which Apollo mission was launched on December 21, 1968, and spent Christmas in lunar orbit?
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