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How do the astronauts communicate in space if sound cannot travel in a vacuum?
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Can we hear sound on Titan?
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How far is each planet from Earth? (Intermediate)
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What is the difference between a "star" and a "sun"? (Beginner)
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At what speed does the Earth move around the Sun? (Beginner)
How do you measure the distance between Earth and the Sun? (Intermediate)
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