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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 galaxy mergers have a major impact on star formation rates within the galaxies?
(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)
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What is the universe expanding into? (Intermediate)
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Does the temperature of matter increase as it is accelerated to relativistic speeds? (Advanced)
What is the difference between a "star" and a "sun"? (Beginner)
Why are there active volcanos on Io? (Intermediate)
What do "homogeneity" and "isotropy" mean? (Intermediate)
How do you measure the distance between Earth and the Sun? (Intermediate)
On which days can I see the Moon in the evening / morning and why is this so? (Beginner)
How are galaxy distances inferred from their recessional velocities? (Intermediate)
What is a dimension? (Intermediate)
What kind of interference must astronomers contend with when observing? (Beginner)
How far is each planet from Earth? (Intermediate)
Is the Moon moving away from the Earth? When was this discovered? (Intermediate)
Why is the moon in a different place every night? (Beginner)
How does the position of Moonrise and Moonset change? (Intermediate)
What is the difference between a "star" and a "sun"? (Beginner)
Why do the planets orbit the sun? (Beginner)
How do you measure the distance between Earth and the Sun? (Intermediate)
How are light and heavy elements formed? (Advanced)
At what speed does the Earth move around the Sun? (Beginner)
How long could life on Earth survive if the Sun stopped shining? (Beginner)
What is the evidence supporting the nebula theory of Solar System formation? (Intermediate)
What is the difference between a "star" and a "sun"? (Beginner)
Is the Moon moving away from the Earth? When was this discovered? (Intermediate)
How does the position of Moonrise and Moonset change? (Intermediate)
How do you measure the distance between Earth and the Sun? (Intermediate)
Why do the planets orbit the sun? (Beginner)
At what speed does the Earth move around the Sun? (Beginner)
How long could life on Earth survive if the Sun stopped shining? (Beginner)
Why is the moon in a different place every night? (Beginner)
How are light and heavy elements formed? (Advanced)
How can we see the Milky Way if we are inside it? (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)
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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Physics
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The History of Astronomy
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