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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 far is each planet from Earth? (Intermediate)
Are there telescopes that can see the flag and lunar rover on the Moon? (Beginner)
Which planet is most similar to Earth? (Intermediate)
How do you measure the distance between Earth and the Sun? (Intermediate)
What would happen if the Moon fell out of its orbit around Earth? (Intermediate)
How does the position of Moonrise and Moonset change? (Intermediate)
Why is the moon in a different place every night? (Beginner)
Earth's Bow Shock (Advanced)
How does night and day work? (Beginner)
Is it possible for amateurs to do optical interferometry? (Intermediate)
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Are there telescopes that can see the flag and lunar rover on the Moon? (Beginner)
What kind of eyepieces do I need to look at planets? (Intermediate)
How far is each planet from Earth? (Intermediate)
How do you measure the distance between Earth and the Sun? (Intermediate)
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Which planet is most similar to Earth? (Intermediate)
Earth's Bow Shock (Advanced)
At what speed does the Earth move around the Sun? (Beginner)
What is the difference between a "star" and a "sun"? (Beginner)
Are there telescopes that can see the flag and lunar rover on the Moon? (Beginner)
How are light and heavy elements formed? (Advanced)
How far is each planet from Earth? (Intermediate)
How do you measure the distance between Earth and the Sun? (Intermediate)
Which planet is most similar to Earth? (Intermediate)
What was the bright, smoothly moving star that I saw? (Beginner)
Why is the moon in a different place every night? (Beginner)
What would happen if the Moon fell out of its orbit around Earth? (Intermediate)
Earth's Bow Shock (Advanced)
How does the position of Moonrise and Moonset change? (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)
How do you measure the distance between Earth and the Sun? (Intermediate)
Is the Moon moving away from the Earth? When was this discovered? (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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