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How can two moons of Saturn share the same orbit?
(Intermediate)
What color would Mars be if you were standing on it?
(Advanced)
Why are Saturn's rings flat?
(Intermediate)
Why did the Pioneer and Voyager take only 2 years to reach Jupiter, while Galileo and Cassini took more than 5 years?
(Intermediate)
Why doesn't the ammonia and methane in Jupiter's atmosphere sink into the core?
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What is the difference between a "star" and a "sun"? (Beginner)
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