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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)
Where did all the water in the universe come from?
(Intermediate)
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What should I know about the upcoming Solar Eclipse? (2017)
What is the universe expanding into? (Intermediate)
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How does astronomy benefit humankind? (Beginner)
Is the gravitational force exerted by the Earth on the Moon equal to the centripetal force acting on the Moon? (Intermediate)
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What is the hottest time of day? (Beginner)
What are the advantages and disadvantages of using a telescope in space? (Intermediate)
How did the stars get named? (Intermediate)
What happens to the Earth as the moon gets farther away and will it ever go away entirely? (Intermediate)
Is there a list of the sizes of different kinds of stars? (Beginner)
Will the seasons change due to precession? (Intermediate)
What skills do astronomers need? (Beginner)
What is the significance of the Tropic of Cancer, Tropic of Capricorn, Arctic Circle and Antarctic Circle? (Beginner)
What color is each planet? (Intermediate)
How are light and heavy elements formed? (Advanced)
How far is each planet from Earth? (Intermediate)
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 is it proved that the Universe is expanding? (Intermediate)
When was the last time all of the planets were aligned? (Beginner)
How does the location of sunrise and sunset change throughout the year? (Advanced)
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)
What is the difference between a "star" and a "sun"? (Beginner)
Why do airplanes take longer to fly West than East? (Intermediate)
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)
How long does it take for the Sun's light to reach us? (Beginner)
What is the significance of the Tropic of Cancer, Tropic of Capricorn, Arctic Circle and Antarctic Circle? (Beginner)
What is the universe expanding into? (Intermediate)
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