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At what speed does the Earth move around the Sun?
(Beginner)
Can I communicate faster than light?
(Advanced)
Can two galaxies move away from each other faster than the speed of light?
(Intermediate)
Considering the motion of the Earth, the solar system, and the galaxy, how fast am I moving while lying in bed asleep?
(Intermediate)
Do supermassive black holes cause galaxy rotation?
(Advanced)
Does the particles involved in a star's final core collapse travel faster than the speed of light?
(Intermediate)
Does the temperature of matter increase as it is accelerated to relativistic speeds?
(Advanced)
How can two moons of Saturn share the same orbit?
(Intermediate)
How fast do particles travel in space?
(Intermediate)
How fast does the Earth go at perihelion and aphelion?
(Intermediate)
If gravity is a "curvature of space" rather than a force, why do a ball and bullet follow different paths?
(Intermediate)
The Moon slows the Earth's rotation, but how fast was it spinning billions of years ago?
(Intermediate)
What if the Earth rotated twice as fast?
(Beginner)
What is the speed of gravity?
(Intermediate)
When measuring the expansion of the universe, do astronomers consider that they're seeing how galaxies moved long ago, not today?
(Intermediate)
When unmanned spacecraft accelerate in space, what causes them to slow down?
(Intermediate)
Why can't a plane fly slowly and let the Earth pass underneath?
(Beginner)
Why do some eclipses take longer than others?
(Intermediate)
Why do spacecraft need heat shields coming back to Earth but not leaving?
(Intermediate)
Why don't skydivers burn up like meteors?
(Beginner)
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How do we know the density of some extrasolar planets? (Intermediate)
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Why is Earth's core molten? (Intermediate)
What will happen to Earth's tides as the moon moves away from us? (Intermediate)
How can spiral galaxies keep their shape? (Advanced)
Does a black hole have a "surface"? (Intermediate)
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What should I know about the upcoming Solar Eclipse (2017)? (Beginner)
Do galaxies that are receding from us faster than the speed of light disappear from our observations? (Intermediate)
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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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Why is looking out into space the same as looking back in time? (Beginner)
Can we find the place where the Big Bang happened? (Intermediate)
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How are light and heavy elements formed? (Advanced)
Are there telescopes that can see the flag and lunar rover on the Moon? (Beginner)
What color is each planet? (Intermediate)
How do you measure the distance between Earth and the Sun? (Intermediate)
How far is each planet from Earth? (Intermediate)
At what speed does the Earth move around the Sun? (Beginner)
Can artificial gravity be created in space? (Intermediate)
What are constellations used for? (Intermediate)
What would happen if an asteroid 10 kilometers across hit the Earth? (Beginner)
What is the universe expanding into? (Intermediate)
What color is each planet? (Intermediate)
At what speed does the Earth move around the Sun? (Beginner)
Can artificial gravity be created in space? (Intermediate)
How are light and heavy elements formed? (Advanced)
Why do the planets orbit the sun? (Beginner)
Are there telescopes that can see the flag and lunar rover on the Moon? (Beginner)
How far is each planet from Earth? (Intermediate)
How do you measure the distance between Earth and the Sun? (Intermediate)
What are constellations used for? (Intermediate)
What is the universe expanding into? (Intermediate)
How are light and heavy elements formed? (Advanced)
What color is each planet? (Intermediate)
At what speed does the Earth move around the Sun? (Beginner)
Can artificial gravity be created in space? (Intermediate)
Why do the planets orbit the sun? (Beginner)
How far is each planet from Earth? (Intermediate)
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)
What is the significance of the Tropic of Cancer, Tropic of Capricorn, Arctic Circle and Antarctic Circle? (Beginner)
What is the difference between a "star" and a "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)
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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