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How can two moons of Saturn share the same orbit?
(Intermediate)
What color would Mars be if you were standing on it?
(Advanced)
Why are Saturn's rings flat?
(Intermediate)
Why did the Pioneer and Voyager take only 2 years to reach Jupiter, while Galileo and Cassini took more than 5 years?
(Intermediate)
Why doesn't the ammonia and methane in Jupiter's atmosphere sink into the core?
(Advanced)
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As the universe expands, why don't galaxies get stretched out? (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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Is the distance from the Earth to the Sun changing? (Advanced)
Does the Mediterranean sea have tides? (Intermediate)
How can we see the Milky Way if we are inside it? (Intermediate)
How does the position of Moonrise and Moonset change? (Intermediate)
How does the location of sunrise and sunset change throughout the year? (Advanced)
Is the Moon moving away from the Earth? When was this discovered? (Intermediate)
Does quantum entanglement imply faster than light communication? (Intermediate)
Which planet is most similar to Earth? (Intermediate)
Can artificial gravity be created in space? (Intermediate)
Why do all the planets orbit in the same plane? (Intermediate)
Is time travel possible? (Beginner)
Are there telescopes that can see the flag and lunar rover on the Moon? (Beginner)
How do you measure the distance between Earth and the Sun? (Intermediate)
What was the bright, smoothly moving star that I saw? (Beginner)
Is the distance from the Earth to the Sun changing? (Advanced)
How does the position of Moonrise and Moonset change? (Intermediate)
Which planet is most similar to Earth? (Intermediate)
How does the location of sunrise and sunset change throughout the year? (Advanced)
How long could life on Earth survive if the Sun stopped shining? (Beginner)
How far is each planet from Earth? (Intermediate)
Are there telescopes that can see the flag and lunar rover on the Moon? (Beginner)
How do you measure the distance between Earth and the Sun? (Intermediate)
How does the position of Moonrise and Moonset change? (Intermediate)
What was the bright, smoothly moving star that I saw? (Beginner)
How does the location of sunrise and sunset change throughout the year? (Advanced)
Which planet is most similar to Earth? (Intermediate)
How far is each planet from Earth? (Intermediate)
What is the difference between a "star" and a "sun"? (Beginner)
What are constellations used for? (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)
How do you measure the distance between Earth and the Sun? (Intermediate)
Is the Moon moving away from the Earth? When was this discovered? (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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