Science

Earthmen first sent a spacecraft to which planet?

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What nearly colorless gas is a form of ozone?
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Which of the following things can move the fastest?
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The word "lunar" means something related to what?
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What type of reproduction uses only one parent cell?
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What is the result when you reduce a ketone?
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What is the potential energy in the nucleus of an atom called?
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Which planet was discovered in 1781 with the help of Bode's Law?
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What does a ruler measure?
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