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As the universe expands, why don't galaxies get stretched out?
(Intermediate)
Can "tired light theory" explain the observed redshifts of galaxies?
(Intermediate)
Can I calculate the size of the Universe by converting light years to kilometres?
(Intermediate)
Can the acceleration of the Universe be analogous to apparent acceleration in a airplane?
(Intermediate)
Can two galaxies move away from each other faster than the speed of light?
(Intermediate)
Can you use an infinite line of reflectors to send light to the edge of the Universe?
(Intermediate)
Cosmologists say the expansion of the universe is accelerating, what is driving this?
(Intermediate)
Could matter-anti-matter repulsion power the expansion of the universe?
(Intermediate)
Could our position in the universe affect our perceptions of the expansion?
(Intermediate)
Could the Universe have expanded faster than the speed of light at the Big Bang?
(Intermediate)
Could you tell me about the life cycle of galaxies?
(Intermediate)
Do galaxies that are receding from us faster than the speed of light disappear from our observations?
(Intermediate)
Does inflation allow for an infinite number of universes?
(Advanced)
How are galaxy distances inferred from their recessional velocities?
(Intermediate)
How can observations of the distant universe prove that the expansion is accelerating *now*?
(Advanced)
How can the Universe expand faster than the speed of light during inflation?
(Advanced)
How can we compare dark matter and dark energy?
(Intermediate)
How can we discern different galaxies/clusters along the same line of sight?
(Intermediate)
How could galaxies have gotten so far away in only 14 billion years?
(Intermediate)
How do galaxies collide in an expanding universe?
(Intermediate)
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What color is each planet? (Intermediate)
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What is the significance of the Tropic of Cancer, Tropic of Capricorn, Arctic Circle and Antarctic Circle? (Beginner)
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How are light and heavy elements formed? (Advanced)
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Are there telescopes that can see the flag and lunar rover on the Moon? (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)
How are light and heavy elements formed? (Advanced)
What is the difference between a "star" and a "sun"? (Beginner)
How does the location of sunrise and sunset change throughout the year? (Advanced)
Can artificial gravity be created in space? (Intermediate)
Why do airplanes take longer to fly West than East? (Intermediate)
When was the last time all of the planets were aligned? (Beginner)
Is the Moon moving away from the Earth? When was this discovered? (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)
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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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