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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 caused the Big Bang and created the Universe? (Beginner)
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When was the last time all of the planets were aligned? (Beginner)
What color is each planet? (Intermediate)
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At what speed does the Earth move around the Sun? (Beginner)
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How far is each planet from Earth? (Intermediate)
When was the last time all of the planets were aligned? (Beginner)
What color is each planet? (Intermediate)
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What color is each planet? (Intermediate)
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How far is each planet from Earth? (Intermediate)
How do you measure the distance between Earth and the Sun? (Intermediate)
At what speed does the Earth move around the Sun? (Beginner)
What is the difference between a "star" and a "sun"? (Beginner)
Why do the planets orbit the sun? (Beginner)
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