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Can any galaxies be seen with the naked eye?
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How can we see galaxies if their stars are so faint?
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Is the Local Group expanding along with the entire Universe?
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Is speed of light the same everywhere ? (Beginner)
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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)
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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 are asteroid compositions and classifications determined? (Intermediate)
How fast do particles travel in space? (Intermediate)
What happens to the helium formed in the Sun? (Beginner)
Why do the size and brightness of the full moon change? (Intermediate)
How does the Sun compare to other stars? (Beginner)
What do a galaxy's colors mean? Are they its true colors? (Intermediate)
How critical is the Earth-Sun distance in maintaining our average temperatures on Earth? (Intermediate)
How does night and day work? (Beginner)
Does the Sun orbit the Earth as well as the Earth orbiting the Sun? (Beginner)
How do we know the age of the Universe and the Earth? (Intermediate)
What was the bright, smoothly moving star that I saw? (Beginner)
What kind of eyepieces do I need to look at planets? (Intermediate)
Are there telescopes that can see the flag and lunar rover on the Moon? (Beginner)
How far is each planet from Earth? (Intermediate)
How do you measure the distance between Earth and the Sun? (Intermediate)
What would happen if the Moon fell out of its orbit around Earth? (Intermediate)
Which planet is most similar to Earth? (Intermediate)
Earth's Bow Shock (Advanced)
At what speed does the Earth move around the Sun? (Beginner)
Is it possible for amateurs to do optical interferometry? (Intermediate)
Are there telescopes that can see the flag and lunar rover on the Moon? (Beginner)
How are light and heavy elements formed? (Advanced)
Which planet is most similar to Earth? (Intermediate)
How far is each planet from Earth? (Intermediate)
How do you measure the distance between Earth and the Sun? (Intermediate)
What was the bright, smoothly moving star that I saw? (Beginner)
What would happen if the Moon fell out of its orbit around Earth? (Intermediate)
Why is the moon in a different place every night? (Beginner)
Earth's Bow Shock (Advanced)
How does the position of Moonrise and Moonset change? (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)
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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