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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?
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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?
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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?
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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?
(Beginner)
How does the color index of a star relate to its actual color?
(Intermediate)
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What elements make up the Sun? (Beginner)
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Which hemisphere has the best view of the Milky Way? (Beginner)
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What color is each planet? (Intermediate)
How are light and heavy elements formed? (Advanced)
How far is each planet from Earth? (Intermediate)
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When was the last time all of the planets were aligned? (Beginner)
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How does the location of sunrise and sunset change throughout the year? (Advanced)
Why do airplanes take longer to fly West than East? (Intermediate)
How is it proved that the Universe is expanding? (Intermediate)
What color is each planet? (Intermediate)
How are light and heavy elements formed? (Advanced)
What is the significance of the Tropic of Cancer, Tropic of Capricorn, Arctic Circle and Antarctic Circle? (Beginner)
How far is each planet from Earth? (Intermediate)
When was the last time all of the planets were aligned? (Beginner)
How do you measure the distance between Earth and the Sun? (Intermediate)
Why do airplanes take longer to fly West than East? (Intermediate)
What is the difference between a "star" and a "sun"? (Beginner)
How does the location of sunrise and sunset change throughout the year? (Advanced)
How is it proved that the Universe is expanding? (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)
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