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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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How do you measure the distance between Earth and the Sun? (Intermediate)
How can we see the Milky Way if we are inside it? (Intermediate)
What would happen if an asteroid 10 kilometers across hit the Earth? (Beginner)
How can the universe be "flat"? We're 3D! (Beginner)
Why is Earth's core molten? (Intermediate)
Why do the planets orbit the sun? (Beginner)
How does the position of Moonrise and Moonset change? (Intermediate)
How long could life on Earth survive if the Sun stopped shining? (Beginner)
Which planet is most similar to Earth? (Intermediate)
Why is the moon in a different place every night? (Beginner)
What would happen if an asteroid 10 kilometers across hit the Earth? (Beginner)
How do you measure the distance between Earth and the Sun? (Intermediate)
Are there telescopes that can see the flag and lunar rover on the Moon? (Beginner)
How does the position of Moonrise and Moonset change? (Intermediate)
How long could life on Earth survive if the Sun stopped shining? (Beginner)
What is the difference between a "star" and a "sun"? (Beginner)
But seriously: what was there before the Big Bang? (Beginner)
How can we see the Milky Way if we are inside it? (Intermediate)
Why do the planets orbit the sun? (Beginner)
Is speed of light the same everywhere ? (Beginner)
What would happen if an asteroid 10 kilometers across hit the Earth? (Beginner)
How do you measure the distance between Earth and the Sun? (Intermediate)
How can we see the Milky Way if we are inside it? (Intermediate)
How long could life on Earth survive if the Sun stopped shining? (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)
Why do the planets orbit the sun? (Beginner)
At what speed does the Earth move around the Sun? (Beginner)
How does the position of Moonrise and Moonset change? (Intermediate)
Why are there high tides during a Full Moon? (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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