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What happens when galaxies collide?
(Beginner)
What is a Cepheid variable?
(Intermediate)
What is a nova?
(Beginner)
What is a star's "spectrum"?
(Beginner)
What is apparent magnitude?
(Intermediate)
What is our galaxy's halo made of, and how was it formed?
(Intermediate)
What is sidereal time?
(Beginner)
What is the difference between a "star" and a "sun"?
(Beginner)
What is the largest star?
(Beginner)
What is the life cycle of a star?
(Intermediate)
What is the observational difference between a star and a planet?
(Beginner)
What is the origin of spiral structure in galaxies?
(Intermediate)
What is the origin of the stellar classification system "OBAFGKM"?
(Intermediate)
What is the physical difference between a star and a planet?
(Intermediate)
What is the relationship between the width of a star trail on a photo and the star's intensity?
(Advanced)
What kinds of star clusters are there?
(Intermediate)
What would happen if two stars collided?
(Intermediate)
What's the object I saw that moved across the sky and then got very bright?
(Beginner)
When did people discover that the Sun is a star?
(Intermediate)
Where are stars born?
(Beginner)
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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)
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What is the difference between a "star" and a "sun"? (Beginner)
Is the speed of light constant? (Beginner)
What was the bright, smoothly moving star that I saw? (Beginner)
How can we see the Milky Way if we are inside it? (Intermediate)
At what speed does the Earth move around the Sun? (Beginner)
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Which planet is most similar to Earth? (Intermediate)
What was the bright, smoothly moving star that I saw? (Beginner)
Are there telescopes that can see the flag and lunar rover on the Moon? (Beginner)
Why is the moon in a different place every night? (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)
What is the difference between a "star" and a "sun"? (Beginner)
Is the distance from the Earth to the Sun changing? (Advanced)
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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