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Galaxies
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Are there any 'lonely galaxies'?
(Beginner)
Are there any dark stars or dark galaxies made of dark matter?
(Advanced)
Are there stars outside of galaxies?
(Beginner)
As the universe expands, why don't galaxies get stretched out?
(Intermediate)
Can "tired light theory" explain the observed redshifts of galaxies?
(Intermediate)
Can any galaxies be seen with the naked eye?
(Beginner)
Can gravitational lensing from intervening galaxies cause the observed ripples in the Cosmic Microwave Background?
(Advanced)
Can supernovae hinder the formation of life in galaxies?
(Beginner)
Can two galaxies move away from each other faster than the speed of light?
(Intermediate)
Can we look back in time and see our galaxy forming?
(Intermediate)
Could the Universe's dark matter be made up of black holes?
(Advanced)
Could there be life in the galaxies nearest to the Milky Way?
(Intermediate)
Could you tell me about the life cycle of galaxies?
(Intermediate)
Do galaxies orbit around anything?
(Intermediate)
Do galaxies that are receding from us faster than the speed of light disappear from our observations?
(Intermediate)
Do stars' orbits in galaxies obey Kepler's Laws?
(Intermediate)
Do supermassive black holes cause galaxy rotation?
(Advanced)
Do we really observe the edges of galaxies at different epochs?
(Advanced)
How are galaxies and solar systems similar?
(Advanced)
How are galaxies formed?
(Intermediate)
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Have the inner planets cleared their neighborhood? (Intermediate)
What caused the Big Bang and created the Universe? (Beginner)
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What is the universe expanding into? (Intermediate)
What do I need to do to become an astronomer? (Beginner)
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Can artificial gravity be created in space? (Intermediate)
Have the inner planets cleared their neighborhood? (Intermediate)
What color is each planet? (Intermediate)
What would happen if the gravity on Earth was suddenly turned off? (Beginner)
If gravity isn't a force, how does it accelerate objects? (Advanced)
Why do the planets orbit the sun? (Beginner)
Can you hear sounds in space? (Beginner)
At what speed does the Earth move around the Sun? (Beginner)
How do you measure the distance between Earth and the Sun? (Intermediate)
What is the difference between a "star" and a "sun"? (Beginner)
What color is each planet? (Intermediate)
Can artificial gravity be created in space? (Intermediate)
What is the significance of the Tropic of Cancer, Tropic of Capricorn, Arctic Circle and Antarctic Circle? (Beginner)
Are there telescopes that can see the flag and lunar rover on the Moon? (Beginner)
What is the difference between a "star" and a "sun"? (Beginner)
How far is each planet from Earth? (Intermediate)
Why do airplanes take longer to fly West than East? (Intermediate)
Why do stars twinkle? (Beginner)
Why do the planets orbit the sun? (Beginner)
At what speed does the Earth move around the Sun? (Beginner)
What color is each planet? (Intermediate)
What is the difference between a "star" and a "sun"? (Beginner)
What is the significance of the Tropic of Cancer, Tropic of Capricorn, Arctic Circle and Antarctic Circle? (Beginner)
Are there telescopes that can see the flag and lunar rover on the Moon? (Beginner)
How far is each planet from Earth? (Intermediate)
Can artificial gravity be created in space? (Intermediate)
Why do stars twinkle? (Beginner)
At what speed does the Earth move around the Sun? (Beginner)
Why do airplanes take longer to fly West than East? (Intermediate)
Why do the planets orbit 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)
What is the significance of the Tropic of Cancer, Tropic of Capricorn, Arctic Circle and Antarctic Circle? (Beginner)
How long does it take for the Sun's light to reach us? (Beginner)
When was the last time all of the planets were aligned? (Beginner)
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The Milky Way
Galaxies
Cosmology & the Big Bang
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Timekeeping
SETI & Extraterrestrial Life
Physics
General Physics
The Theory of Relativity
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Space Exploration & Astronauts
The History of Astronomy
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