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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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But seriously: what was there before the Big Bang? (Beginner)
How far can photons move freely in the early universe (Advanced)
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What is the universe expanding into? (Intermediate)
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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)
Why is the moon in a different place every night? (Beginner)
What was the bright, smoothly moving star that I saw? (Beginner)
Which planet is most similar to Earth? (Intermediate)
How far is each planet from Earth? (Intermediate)
What is the difference between a "star" and a "sun"? (Beginner)
How does the position of Moonrise and Moonset change? (Intermediate)
How long does the supernova stage of a star last? (Intermediate)
Is the distance from the Earth to the Sun changing? (Advanced)
What was the bright, smoothly moving star that I saw? (Beginner)
Why is the moon in a different place every night? (Beginner)
Are there telescopes that can see the flag and lunar rover on the Moon? (Beginner)
How does the position of Moonrise and Moonset change? (Intermediate)
How do you measure the distance between Earth and the Sun? (Intermediate)
What is the difference between a "star" and a "sun"? (Beginner)
At what speed does the Earth move around the Sun? (Beginner)
Which planet is most similar to Earth? (Intermediate)
How far is each planet from Earth? (Intermediate)
Is the distance from the Earth to the Sun changing? (Advanced)
Are there telescopes that can see the flag and lunar rover on the Moon? (Beginner)
What was the bright, smoothly moving star that I saw? (Beginner)
How do you measure the distance between Earth and the Sun? (Intermediate)
Why is the moon in a different place every night? (Beginner)
How does the position of Moonrise and Moonset change? (Intermediate)
Is the distance from the Earth to the Sun changing? (Advanced)
What is the difference between a "star" and a "sun"? (Beginner)
At what speed does the Earth move around the Sun? (Beginner)
Is the Moon moving away from the Earth? When was this discovered? (Intermediate)
Which planet is most similar to Earth? (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)
How do you measure the distance between Earth and the Sun? (Intermediate)
Is the Moon moving away from the Earth? When was this discovered? (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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Physics
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The History of Astronomy
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