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What kind of interference must astronomers contend with when observing?
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At what speed does the Earth move around the Sun? (Beginner)
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What color is each planet? (Intermediate)
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What is the significance of the Tropic of Cancer, Tropic of Capricorn, Arctic Circle and Antarctic Circle? (Beginner)
What is the difference between a "star" and a "sun"? (Beginner)
When was the last time all of the planets were aligned? (Beginner)
Can artificial gravity be created in space? (Intermediate)
Is the Moon moving away from the Earth? When was this discovered? (Intermediate)
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Why do the planets orbit the sun? (Beginner)
What's going to happen on December 21st 2012? (Intermediate)
What color is each planet? (Intermediate)
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Is the Moon moving away from the Earth? When was this discovered? (Intermediate)
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Why do the planets orbit the sun? (Beginner)
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