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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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Why is twilight short near the equator? (Intermediate)
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What was the bright, smoothly moving star that I saw? (Beginner)
What happened to the Arecibo Telescope? (Beginner)
Can I buy or name a star? (Beginner)
If I were hypothetically wearing a spacesuit and sitting on one of the Voyager space probes at their current positions in space, how much light would I have? (Intermediate)
What makes certain lunar eclipses so special? (Beginner)
Why is Earth's core molten? (Intermediate)
What will happen to Earth's tides as the moon moves away from us? (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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Can we find the place where the Big Bang happened? (Intermediate)
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What is that ring (or rainbow) around the moon? (Beginner)
How does the position of Moonrise and Moonset change? (Intermediate)
How do you measure the distance between Earth and the Sun? (Intermediate)
How long could life on Earth survive if the Sun stopped shining? (Beginner)
Why do the planets orbit the sun? (Beginner)
Are there telescopes that can see the flag and lunar rover on the Moon? (Beginner)
How does the location of sunrise and sunset change throughout the year? (Advanced)
At what speed does the Earth move around the Sun? (Beginner)
What is the difference between a "star" and a "sun"? (Beginner)
Which planet is most similar to Earth? (Intermediate)
How do you measure the distance between Earth and the Sun? (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)
What is that ring (or rainbow) around the moon? (Beginner)
How does the position of Moonrise and Moonset change? (Intermediate)
Are there telescopes that can see the flag and lunar rover on the Moon? (Beginner)
At what speed does the Earth move around the 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 the planets orbit the sun? (Beginner)
If gravity isn't a force, how does it accelerate objects? (Advanced)
How do you measure the distance between Earth and the Sun? (Intermediate)
Why do the planets orbit the sun? (Beginner)
What is the difference between a "star" and a "sun"? (Beginner)
At what speed does the Earth move around the Sun? (Beginner)
Can artificial gravity be created in space? (Intermediate)
Which planet is most similar to Earth? (Intermediate)
How does the position of Moonrise and Moonset change? (Intermediate)
How do we know the Milky Way is a spiral galaxy? (Intermediate)
Are there telescopes that can see the flag and lunar rover on the Moon? (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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