Science

What is a space which is entirely devoid of matter called in science terms?

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Who was the last person to set foot on the moon in 1972?
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What metal is used for most electrical wire and cable?
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The image of an object when seen in a mirror is called what?
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Optics is the study of what?
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Who was the commander of the first U.S. Space Shuttle mission?
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What is the summer counterpart of hibernation?
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Transfer of heat through a substance by molecular action best fits which science term?
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The oldest living tree is 4,843 years old and can be found where?
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