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Does the Moon rotate? Are there other moons that always keep one face toward their planet?
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Is Earth-moon tidal friction causing global warming?
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Is the distance from the Earth to the Sun changing?
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Is the Moon moving away from the Earth? When was this discovered?
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The Moon slows the Earth's rotation, but how fast was it spinning billions of years ago?
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What would happen if we did not have a Moon?
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Why are there active volcanos on Io?
(Intermediate)
Why do most moons orbit their planets at the equator?
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Why does the Earth only see one side of the Moon?
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Do galaxies that are receding from us faster than the speed of light disappear from our observations? (Intermediate)
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What is a graviton? (Intermediate)
Why are there high tides during a Full Moon? (Intermediate)
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What is the universe expanding into? (Intermediate)
What do I need to do to become an astronomer? (Beginner)
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Can we find the place where the Big Bang happened? (Intermediate)
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What caused the Big Bang and created the Universe? (Beginner)
What color is Venus? (Beginner)
Will we ever stop having solar eclipses because of the moon's motion away from the Earth? (Intermediate)
Why do the size and brightness of the full moon change? (Intermediate)
How are elements heavier than iron formed? (Intermediate)
What would happen if Earth had more than one moon? (Intermediate)
How do we know the mass of the Earth and the Moon? (Advanced)
How do you calculate the azimuth and altitude of an object? (Intermediate)
How will the two black holes that are going to collide affect Earth? (Beginner)
What happens to spacetime inside a black hole? (Intermediate)
What color is each planet? (Intermediate)
Are the planes of solar systems aligned with the plane of the Galaxy? (Intermediate)
How do you measure the distance between Earth and the Sun? (Intermediate)
Why is the Universe flat and not spherical? (Advanced)
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)
Why do airplanes take longer to fly West than East? (Intermediate)
At what speed does the Earth move around the Sun? (Beginner)
What is the difference between a "star" and a "sun"? (Beginner)
How far is each planet from Earth? (Intermediate)
What color is each planet? (Intermediate)
How do you measure the distance between Earth and the Sun? (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)
When was the last time all of the planets were aligned? (Beginner)
What is the difference between a "star" and a "sun"? (Beginner)
How far is each planet from Earth? (Intermediate)
Why do airplanes take longer to fly West than East? (Intermediate)
How does the location of sunrise and sunset change throughout the year? (Advanced)
How are light and heavy elements formed? (Advanced)
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)
How long does it take for the Sun's light to reach us? (Beginner)
What is the universe expanding into? (Intermediate)
When will Halley's Comet return? (Intermediate)
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