Science

How many astronauts walked on the moon before 1970?

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What nearly colorless gas is a form of ozone?
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Which man-made waterway is 100.76 miles long?
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What word is given to sounds that are too high for humans to hear?
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Which of these planets is smallest in diameter?
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What is the theory of the beginning of the universe called?
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What is the proper name for a "sundog", or an atmospheric optical phenomenon?
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Which scientific term is defined as the rate at which a wave oscillates in cycles?
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How often does sunspot activity reach its lowest point?
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