Science

Earthmen first sent a spacecraft to which planet?

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Which is the approximate angle at which the Earth inclines?
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What is a geiger counter used to measure?
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What system of measurement is used in science?
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What force slows down a rolling ball?
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What satellite series was known as "fellow traveler"?
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Marie Curie spent much time studying which of these subjects?
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What is the square root of 625?
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What is the name of the spacecraft that took the first men to the moon?
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