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Has anyone ever seen a star "turn on"?
(Beginner)
How are light and heavy elements formed?
(Advanced)
How are planets detected around other stars?
(Intermediate)
How big is the Hubble Ultra Deep Field image?
(Intermediate)
How can a star burn with no oxygen?
(Beginner)
How can I calculate distances between stars?
(Advanced)
How can I find the star I have "bought"?
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How can I measure the distance of a star?
(Beginner)
How can we distinguish a star's "real" color from the change in color that we observe due to the star's motion?
(Intermediate)
How can we measure distances to more stars?
(Intermediate)
How did the stars get named?
(Intermediate)
How do astronomers measure the brightness of stars?
(Intermediate)
How do astronomers measure the radius of a star?
(Intermediate)
How do stars move in the Galaxy?
(Intermediate)
How do we find out about the star formation histories of galaxies?
(Intermediate)
How do we know what other planets (and stars, galaxies, etc.) are made of?
(Intermediate)
How do we measure distances to other stars?
(Beginner)
How do you measure the mass of a star?
(Beginner)
How does a star take mass from another star?
(Intermediate)
How does the brightness of a star depend on its distance from us?
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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)
Does the Sun rotate? (Intermediate)
How far is each planet from Earth? (Intermediate)
At what speed does the Earth move around the Sun? (Beginner)
How long could life on Earth survive if the Sun stopped shining? (Beginner)
Is the Local Group expanding along with the entire Universe? (Intermediate)
How does the position of Moonrise and Moonset change? (Intermediate)
Why is the moon in a different place every night? (Beginner)
Which planet is most similar to Earth? (Intermediate)
Are there telescopes that can see the flag and lunar rover on the Moon? (Beginner)
How far is each planet from Earth? (Intermediate)
How do you measure the distance between Earth and the Sun? (Intermediate)
Which planet is most similar to Earth? (Intermediate)
Why is the moon in a different place every night? (Beginner)
Why do the planets orbit the sun? (Beginner)
How can the Universe expand faster than the speed of light during inflation? (Advanced)
How long could life on Earth survive if the Sun stopped shining? (Beginner)
At what speed does the Earth move around the Sun? (Beginner)
How does the position of Moonrise and Moonset change? (Intermediate)
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)
How far is each planet from Earth? (Intermediate)
Why is the moon in a different place every night? (Beginner)
How does the position of Moonrise and Moonset change? (Intermediate)
Which planet is most similar to Earth? (Intermediate)
Why do the planets orbit the sun? (Beginner)
What was the bright, smoothly moving star that I saw? (Beginner)
Why do we not have eclipses every month? (Beginner)
At what speed does the Earth move around the Sun? (Beginner)
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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