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Are the asteroids the remains of a planet which broke apart?
(Beginner)
Are there any dark stars or dark galaxies made of dark matter?
(Advanced)
Can artificial gravity be created in space?
(Intermediate)
Can we prove that the Moon isn't hollow?
(Intermediate)
Could neutrinos be dark matter?
(Intermediate)
Could the Universe's dark matter be made up of black holes?
(Advanced)
Do binary or triple star systems form together?
(Intermediate)
Do stars' orbits in galaxies obey Kepler's Laws?
(Intermediate)
Does the singularity in a black hole create a new Universe?
(Intermediate)
Does the Sun orbit the Earth as well as the Earth orbiting the Sun?
(Beginner)
Have the inner planets cleared their neighborhood?
(Intermediate)
How are black holes discovered?
(Intermediate)
How are black holes made? Could one be made close to us?
(Beginner)
How big was the Sun when it first "fired up"?
(Intermediate)
How can the Sun have such a strong gravitational field if it's made of gases?
(Beginner)
How do photons from distant objects maintain enough energy to reach us?
(Intermediate)
How do rockets work?
(Intermediate)
How do we know the density of some extrasolar planets?
(Intermediate)
How do we know the mass of the Earth and the Moon?
(Advanced)
How do we know what parameters to use when simulating the collision of the Milky Way and Andromeda?
(Advanced)
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Could there have been multiple Big Bangs at different places in the universe? (Intermediate)
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How do we know what we observe is x light years away? (Beginner)
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What what a black hole merger look like from a telescope? (Advanced)
Do galaxy mergers have a major impact on star formation rates within the galaxies? (Intermediate)
Our universe is still expanding, does that mean things in our daily life are expanding? (Intermediate)
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)
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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)
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How are light and heavy elements formed? (Advanced)
What is the difference between a "star" and a "sun"? (Beginner)
How does the location of sunrise and sunset change throughout the year? (Advanced)
How can a star burn with no oxygen? (Beginner)
Why do the planets orbit the sun? (Beginner)
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)
If gravity isn't a force, how does it accelerate objects? (Advanced)
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)
What is the difference between a "star" and a "sun"? (Beginner)
How are light and heavy elements formed? (Advanced)
Why do the planets orbit the sun? (Beginner)
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)
How does the location of sunrise and sunset change throughout the year? (Advanced)
How does the position of Moonrise and Moonset change? (Intermediate)
At what speed does the Earth move around the Sun? (Beginner)
Which planet is most similar to Earth? (Intermediate)
If gravity isn't a force, how does it accelerate objects? (Advanced)
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 the planets orbit the sun? (Beginner)
How are light and heavy elements formed? (Advanced)
How long could life on Earth survive if the Sun stopped shining? (Beginner)
How does the position of Moonrise and Moonset change? (Intermediate)
At what speed does the Earth move around the Sun? (Beginner)
How does the location of sunrise and sunset change throughout the year? (Advanced)
Which planet is most similar to Earth? (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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Physics
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