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Did I see the Aurora Borealis as a child?
(Beginner)
Do the Earth's magnetic poles ever change places?
(Intermediate)
Do the Sun's or Earth's magnetic field reverse?
(Intermediate)
How are sunspots formed?
(Intermediate)
How do solar flares affect airline pilots?
(Intermediate)
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(Intermediate)
If nothing can escape a black hole, why do some black holes have jets?
(Intermediate)
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(Intermediate)
What causes the aurora?
(Beginner)
Why does Titan, in spite of being smaller than Mars, have an atmosphere more dense than Earth's?
(Intermediate)
Why don't all neutron stars become pulsars?
(Advanced)
Will the magnetic field of the Earth reverse its direction in the future? Will this cause problems?
(Advanced)
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What would happen if you took off your helmet in space? (Beginner)
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Do galaxies that are receding from us faster than the speed of light disappear from our observations? (Intermediate)
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Can two galaxies move away from each other faster than the speed of light? (Intermediate)
What is a graviton? (Intermediate)
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What caused the Big Bang and created the Universe? (Beginner)
If spacetime is curved, is it possible for us to look into space and see light from Earth from long ago? (Intermediate)
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What should I know about the upcoming Solar Eclipse? (2017)
What is the universe expanding into? (Intermediate)
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Why is looking out into space the same as looking back in time? (Beginner)
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How are light and heavy elements formed? (Advanced)
What color is each planet? (Intermediate)
How are elements heavier than iron formed? (Intermediate)
What is the difference between a "star" and a "sun"? (Beginner)
At what speed does the Earth move around the Sun? (Beginner)
Why do airplanes take longer to fly West than East? (Intermediate)
Why can't a plane fly slowly and let the Earth pass underneath? (Beginner)
Can artificial gravity be created in space? (Intermediate)
Why do stars twinkle? (Beginner)
When was the last time all of the planets were aligned? (Beginner)
How are light and heavy elements formed? (Advanced)
What color is each planet? (Intermediate)
Can artificial gravity be created in space? (Intermediate)
What is the difference between a "star" and a "sun"? (Beginner)
At what speed does the Earth move around the Sun? (Beginner)
Why do airplanes take longer to fly West than East? (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)
Does the Moon look different in the northern and southern hemispheres? (Beginner)
How are elements heavier than iron formed? (Intermediate)
How are light and heavy elements formed? (Advanced)
What color is each planet? (Intermediate)
Can artificial gravity be created in space? (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)
At what speed does the Earth move around the Sun? (Beginner)
What is the difference between a "star" and a "sun"? (Beginner)
How do you measure the distance between Earth and the Sun? (Intermediate)
Why do airplanes take longer to fly West than East? (Intermediate)
Why do the planets orbit the 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)
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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