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Can you use an infinite line of reflectors to send light to the edge of the Universe? (Intermediate)
Could someone travel the universe in his or her own lifetime? (Beginner)
How are photons created and destroyed? (Advanced)
How do photons from distant objects maintain enough energy to reach us? (Intermediate)
How do planets capture satellites? (Advanced)
How do you calculate the lifetime of the Sun? (Advanced)
How long do supernova remnants last? (Intermediate)
How much power is contained in a beam of light? (Intermediate)
How powerful are quasars? (Intermediate)
Is cosmic expansion happening on microscopic scales? (Advanced)
Is light of different colors affected differently by gravity? (Intermediate)
What causes a particle to decay? (Intermediate)
What is the photoelectric effect? Why can't multiple low-frequency photons free an electron? (Intermediate)
What type of energy does a black hole have? (Intermediate)
When the Sun converts mass to energy, do the orbits of the planets change? (Advanced)
Where did the matter in the universe come from? (Intermediate)
Where did the Universe come from? (Intermediate)
Where does the kinetic energy of infalling bodies come from? (Intermediate)

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How often does the Sun pass through a spiral arm in the Milky Way? (Intermediate)

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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)
How can spiral galaxies keep their shape? (Advanced)
Does a black hole have a "surface"? (Intermediate)
How can you link telescopes to make a bigger "effective telescope"? (Intermediate)
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)
Why are astronomers interested in gravitational waves? (Intermediate)

Editor's Pick

What is the universe expanding into? (Intermediate)
What do I need to do to become an astronomer? (Beginner)
What's the difference between astronomy and astrology? (Beginner)
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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What color is each planet? (Intermediate)
How far is each planet from Earth? (Intermediate)
Why do stars twinkle? (Beginner)
What would happen if an asteroid 10 kilometers across hit the Earth? (Beginner)
What is the difference between a "star" and a "sun"? (Beginner)
At what speed does the Earth move around the Sun? (Beginner)
Why can't a plane fly slowly and let the Earth pass underneath? (Beginner)
What is the significance of the Tropic of Cancer, Tropic of Capricorn, Arctic Circle and Antarctic Circle? (Beginner)
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)

What color is each planet? (Intermediate)
How far is each planet from Earth? (Intermediate)
At what speed does the Earth move around the Sun? (Beginner)
Why can't a plane fly slowly and let the Earth pass underneath? (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)
Are there telescopes that can see the flag and lunar rover on the Moon? (Beginner)
What would happen if an asteroid 10 kilometers across hit the Earth? (Beginner)
Why do the planets orbit the sun? (Beginner)
Is the Moon moving away from the Earth? When was this discovered? (Intermediate)

What color is each planet? (Intermediate)
Are there telescopes that can see the flag and lunar rover on the Moon? (Beginner)
How far is each planet from Earth? (Intermediate)
If gravity isn't a force, how does it accelerate objects? (Advanced)
Why can't a plane fly slowly and let the Earth pass underneath? (Beginner)
What is the difference between a "star" and a "sun"? (Beginner)
What would happen if an asteroid 10 kilometers across hit the Earth? (Beginner)
At what speed does the Earth move around the Sun? (Beginner)
What is the significance of the Tropic of Cancer, Tropic of Capricorn, Arctic Circle and Antarctic Circle? (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)
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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