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How can you tell if a crescent moon is preceding or following a new-moon phase?
(Beginner)
How different would the night sky have looked in 40,000 B.C.?
(Intermediate)
How do astronomers observe the Sun's interior?
(Intermediate)
How do distant galaxies differ from those nearby?
(Advanced)
How do I explain to my children why the Moon has phases?
(Beginner)
How do I maximize my chances of seeing shooting stars?
(Intermediate)
How do I tell which planet is which?
(Beginner)
How do we detect incoming meteorites?
(Intermediate)
How do we determine the age of the universe?
(Advanced)
How do we know what parameters to use when simulating the collision of the Milky Way and Andromeda?
(Advanced)
How does libration allow us to see more than 50% of the Moon?
(Advanced)
How does light pollution affect astronomers?
(Intermediate)
How does the location of sunrise and sunset change throughout the year?
(Advanced)
How does the position of Moonrise and Moonset change?
(Intermediate)
How is it that we see farther out in space (farther back in time) than in the past?
(Beginner)
How likely is it for a planet to transit its star?
(Intermediate)
How long does it take the Big Dipper to move in the sky?
(Intermediate)
How many known galaxies are there?
(Intermediate)
How much can the location of sunset differ from due West?
(Intermediate)
If I were traveling through space, could I see distant galaxies with my own eyes?
(Intermediate)
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What caused the Big Bang and created the Universe? (Beginner)
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What color is each planet? (Intermediate)
When was the last time all of the planets were aligned? (Beginner)
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What color is each planet? (Intermediate)
Why are the Moon and Sun sometimes orange or red? (Beginner)
When was the last time all of the planets were aligned? (Beginner)
What is the significance of the Tropic of Cancer, Tropic of Capricorn, Arctic Circle and Antarctic Circle? (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 do you measure the distance between Earth and the Sun? (Intermediate)
How does the position of Moonrise and Moonset change? (Intermediate)
Can artificial gravity be created in space? (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)
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 significance of the Tropic of Cancer, Tropic of Capricorn, Arctic Circle and Antarctic Circle? (Beginner)
What is the universe expanding into? (Intermediate)
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