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What color would Mars be if you were standing on it?
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What do astronauts do all day in the International Space Station?
(Intermediate)
What do astronauts eat in space? Can they grow food?
(Beginner)
What would happen if a human were exposed to space without wearing a spacesuit?
(Intermediate)
What would happen if you took off your helmet in space?
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Who has landed on the moon?
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Why do astronauts in space need to exercise?
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Why do humans want to go in space?
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Why do photos of space taken from space never show any stars?
(Intermediate)
Why doesn't NASA build rotating spacecraft to simulate gravity?
(Intermediate)
Why don't astronauts sublimate in space?
(Advanced)
Will astronauts ever be able to go ice-skating on Europa?
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Why are there both high and low tides? (Intermediate)
What are the names of the earth, moon, sun, and solar system? (Beginner)
Why is twilight short near the equator? (Intermediate)
What's going to happen on December 21st 2012? (Intermediate)
What color is each planet? (Intermediate)
At what speed does the Earth move around the Sun? (Beginner)
What is the significance of the Tropic of Cancer, Tropic of Capricorn, Arctic Circle and Antarctic Circle? (Beginner)
Is the distance from the Earth to the Sun changing? (Advanced)
How does night and day work? (Beginner)
Why do the planets orbit the sun? (Beginner)
What color is each planet? (Intermediate)
What is the significance of the Tropic of Cancer, Tropic of Capricorn, Arctic Circle and Antarctic Circle? (Beginner)
At what speed does the Earth move around the Sun? (Beginner)
Why do the planets orbit the sun? (Beginner)
How far is each planet from Earth? (Intermediate)
Why are the Moon and Sun sometimes orange or red? (Beginner)
Why do stars twinkle? (Beginner)
How do you measure the distance between Earth and the Sun? (Intermediate)
What are the requirements for being a planet? (Beginner)
Is the distance from the Earth to the Sun changing? (Advanced)
What color is each planet? (Intermediate)
At what speed does the Earth move around the Sun? (Beginner)
What is the significance of the Tropic of Cancer, Tropic of Capricorn, Arctic Circle and Antarctic Circle? (Beginner)
How far is each planet from Earth? (Intermediate)
Why do the planets orbit the sun? (Beginner)
Are there telescopes that can see the flag and lunar rover on the Moon? (Beginner)
How do you measure the distance between Earth and the Sun? (Intermediate)
What would happen if an asteroid 10 kilometers across hit the Earth? (Beginner)
What is the difference between a "star" and a "sun"? (Beginner)
Why do stars twinkle? (Beginner)
What's going to happen on December 21st 2012? (Intermediate)
What color is each planet? (Intermediate)
At what speed does the Earth move around the Sun? (Beginner)
How far is each planet from Earth? (Intermediate)
Is the Moon moving away from the Earth? When was this discovered? (Intermediate)
How do you measure the distance between Earth and the Sun? (Intermediate)
Why do the planets orbit the sun? (Beginner)
What is the significance of the Tropic of Cancer, Tropic of Capricorn, Arctic Circle and Antarctic Circle? (Beginner)
When was the last time all of the planets were aligned? (Beginner)
How long does it take for the Sun's light to reach us? (Beginner)
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