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Can any galaxies be seen with the naked eye?
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What is the difference between a "star" and a "sun"? (Beginner)
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If gravity isn't a force, how does it accelerate objects? (Advanced)
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 difference between a "star" and a "sun"? (Beginner)
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Why do the planets orbit the sun? (Beginner)
Which planet is most similar to Earth? (Intermediate)
How are light and heavy elements formed? (Advanced)
How does the position of Moonrise and Moonset change? (Intermediate)
At what speed does the Earth move around the Sun? (Beginner)
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Are there telescopes that can see the flag and lunar rover on the Moon? (Beginner)
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What color is each planet? (Intermediate)
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Why do the planets orbit the sun? (Beginner)
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