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When was the last time all of the planets were aligned? (Beginner)
What is the difference between a "star" and a "sun"? (Beginner)
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How far is each planet from Earth? (Intermediate)
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How far is each planet from Earth? (Intermediate)
Why do airplanes take longer to fly West than East? (Intermediate)
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How does the position of Moonrise and Moonset change? (Intermediate)
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