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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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How do you measure the distance between Earth and the Sun? (Intermediate)
How can we see the Milky Way if we are inside it? (Intermediate)
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Is the Sun expanding? Will it ever explode? (Beginner)
What would happen if an asteroid 10 kilometers across hit the Earth? (Beginner)
At what speed does the Earth move around the Sun? (Beginner)
How can the universe be "flat"? We're 3D! (Beginner)
Are there telescopes that can see the flag and lunar rover on the Moon? (Beginner)
What is the universe expanding into? (Intermediate)
How long could life on Earth survive if the Sun stopped shining? (Beginner)
What would happen if an asteroid 10 kilometers across hit the Earth? (Beginner)
How do you measure the distance between Earth and the Sun? (Intermediate)
How can we see the Milky Way if we are inside it? (Intermediate)
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 long could life on Earth survive if the Sun stopped shining? (Beginner)
Is the Sun expanding? Will it ever explode? (Beginner)
Why do the planets orbit the sun? (Beginner)
Why is Earth's core molten? (Intermediate)
Why is the moon in a different place every night? (Beginner)
What would happen if an asteroid 10 kilometers across hit the Earth? (Beginner)
How do you measure the distance between Earth and the Sun? (Intermediate)
How can we see the Milky Way if we are inside it? (Intermediate)
Are there telescopes that can see the flag and lunar rover on the Moon? (Beginner)
How long could life on Earth survive if the Sun stopped shining? (Beginner)
What is the difference between a "star" and a "sun"? (Beginner)
Why do the planets orbit the sun? (Beginner)
At what speed does the Earth move around the Sun? (Beginner)
How does the position of Moonrise and Moonset change? (Intermediate)
Why are there high tides during a Full Moon? (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)
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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