Science

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

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How many Earth years does it take Mars to go around the Sun?
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Which of these is the formula to convert Fahrenheit to Celsius?
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Halley's Comet is predicted to appear again in which year?
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What is water stored beneath the surface of the Earth called?
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Where is the observatory where Percival Lowell first theorized the existence of Pluto?
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Which of the following things can move the fastest?
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Deep trenches such as the Grand Canyon were formed by what process?
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What is a process used by plants to convert light energy into chemical energy?
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