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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)
How do we know that sunspots are associated with the Sun's magnetic field?
(Intermediate)
If nothing can escape a black hole, why do some black holes have jets?
(Intermediate)
What are some of the effects of solar flares on Earth?
(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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Are time machines possible? (Intermediate)
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Is speed of light the same everywhere ? (Beginner)
How does Venus have sulphuric acid in it's clouds? (Beginner)
Earth's Bow Shock (Advanced)
How much does the Earth "wobble" on its orbit due to the Moon's gravity? (Intermediate)
Why is the sun red? During sunset, Northeastern US, Summer 2021 (Beginner)
Why do rays from Sun appear to converge at a point? (Beginner)
But seriously: what was there before the Big Bang? (Beginner)
How far can photons move freely in the early universe (Advanced)
How likely is it that the Solar System has had or will have a close encounter with another star? (Intermediate)
How do we know what we observe is x light years away? (Beginner)
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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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How do you measure the distance between Earth and the Sun? (Intermediate)
How can we see the Milky Way if we are inside it? (Intermediate)
What would happen if an asteroid 10 kilometers across hit the Earth? (Beginner)
How can the universe be "flat"? We're 3D! (Beginner)
Why is Earth's core molten? (Intermediate)
Why do the planets orbit the sun? (Beginner)
How long could life on Earth survive if the Sun stopped shining? (Beginner)
Which planet is most similar to Earth? (Intermediate)
How does the position of Moonrise and Moonset change? (Intermediate)
Why is the moon in a different place every night? (Beginner)
What would happen if an asteroid 10 kilometers across hit the Earth? (Beginner)
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)
How does the position of Moonrise and Moonset change? (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)
But seriously: what was there before the Big Bang? (Beginner)
How can we see the Milky Way if we are inside it? (Intermediate)
Why do the planets orbit the sun? (Beginner)
Is speed of light the same everywhere ? (Beginner)
What would happen if an asteroid 10 kilometers across hit the Earth? (Beginner)
How do you measure the distance between Earth and the Sun? (Intermediate)
How can we see the Milky Way if we are inside it? (Intermediate)
How long could life on Earth survive if the Sun stopped shining? (Beginner)
Are there telescopes that can see the flag and lunar rover on the Moon? (Beginner)
What is the difference between a "star" and a "sun"? (Beginner)
Why do the planets orbit the sun? (Beginner)
At what speed does the Earth move around the Sun? (Beginner)
How does the position of Moonrise and Moonset change? (Intermediate)
Why are there high tides during a Full Moon? (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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Physics
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The History of Astronomy
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