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Are there any 'lonely galaxies'?
(Beginner)
Has anyone made a map of the Milky Way?
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How can we see the Milky Way if we are inside it?
(Intermediate)
How can we tell what the interiors of planets are like?
(Advanced)
How do we know that superclusters are the largest structures in the universe?
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Is the Local Group expanding along with the entire Universe?
(Intermediate)
What do "homogeneity" and "isotropy" mean?
(Intermediate)
What is the largest structure in the universe?
(Intermediate)
What is the origin of spiral structure in galaxies?
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Where, in relation to the entire universe, is the Milky Way located?
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Why do we assume that the universe is homogeneous?
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Why doesn't the ammonia and methane in Jupiter's atmosphere sink into the core?
(Advanced)
Would a planet near the galactic center have a brighter night sky?
(Intermediate)
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Why aren't accretion disks around giant stars as hot as accretion disks around black holes? (Advanced)
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Do galaxies that are receding from us faster than the speed of light disappear from our observations? (Intermediate)
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Can two galaxies move away from each other faster than the speed of light? (Intermediate)
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What caused the Big Bang and created the Universe? (Beginner)
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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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What color is each planet? (Intermediate)
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)
How do you measure the distance between Earth and the Sun? (Intermediate)
Why do airplanes take longer to fly West than East? (Intermediate)
What are constellations used for? (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)
When was the last time all of the planets were aligned? (Beginner)
Can artificial gravity be created in space? (Intermediate)
What color is each planet? (Intermediate)
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)
What is the difference between a "star" and a "sun"? (Beginner)
Why do airplanes take longer to fly West than East? (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)
Does your weight change between the poles and the equator? (Intermediate)
How does the location of sunrise and sunset change throughout the year? (Advanced)
Is the distance from the Earth to the Sun changing? (Advanced)
What color is each planet? (Intermediate)
Why is Neptune still considered a planet when Pluto crosses its orbit? (Intermediate)
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)
What is the difference between a "star" and a "sun"? (Beginner)
Why do airplanes take longer to fly West than East? (Intermediate)
How do you measure the distance between Earth and the Sun? (Intermediate)
When was the last time all of the planets were aligned? (Beginner)
Can artificial gravity be created in space? (Intermediate)
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)
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 universe expanding into? (Intermediate)
What is the significance of the Tropic of Cancer, Tropic of Capricorn, Arctic Circle and Antarctic Circle? (Beginner)
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