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Can any galaxies be seen with the naked eye?
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Is the Local Group expanding along with the entire Universe?
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Where does the kinetic energy of infalling bodies come from? (Intermediate)
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Is speed of light the same everywhere ? (Beginner)
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Earth's Bow Shock (Advanced)
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Why is the sun red? During sunset, Northeastern US, Summer 2021 (Beginner)
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But seriously: what was there before the Big Bang? (Beginner)
How far can photons move freely in the early universe (Advanced)
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What is the universe expanding into? (Intermediate)
What do I need to do to become an astronomer? (Beginner)
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Are there telescopes that can see the flag and lunar rover on the Moon? (Beginner)
When the Sun converts mass to energy, do the orbits of the planets change? (Advanced)
Is it possible for amateurs to do optical interferometry? (Intermediate)
How do we determine the age of the universe? (Advanced)
Is time travel possible? (Beginner)
What was the bright, smoothly moving star that I saw? (Beginner)
How does the location of sunrise and sunset change throughout the year? (Advanced)
How are light and heavy elements formed? (Advanced)
What class of spiral galaxy is the Milky Way? (Intermediate)
Can life exist on the recently discovered extrasolar planets? (Beginner)
Is time travel possible? (Beginner)
When was the last time all of the planets were aligned? (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)
What was the bright, smoothly moving star that I saw? (Beginner)
How long could life on Earth survive if the Sun stopped shining? (Beginner)
What is the difference between a "star" and a "sun"? (Beginner)
How far is each planet from Earth? (Intermediate)
Which planet is most similar to Earth? (Intermediate)
How does the location of sunrise and sunset change throughout the year? (Advanced)
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)
How does the position of Moonrise and Moonset change? (Intermediate)
How does the location of sunrise and sunset change throughout the year? (Advanced)
Which planet is most similar to Earth? (Intermediate)
What are constellations used for? (Intermediate)
What is the difference between a "star" and a "sun"? (Beginner)
How far is each planet from Earth? (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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