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A line drawn perpendicular to a line through the tips of the horns of the crescent moon doesn't point to the Sun! Why not?
(Advanced)
Are there solar tides?
(Beginner)
At what speed does the Earth move around the Sun?
(Beginner)
Can a lunar and a solar eclipse happen in the same month? When will this happen next?
(Intermediate)
Can I build an instrument to measure the size of the Sun and of the Moon?
(Intermediate)
Can the Sun be closer to the Earth than any planet is to Earth?
(Intermediate)
Can the sun rise from the west on Mars?
(Beginner)
Can the theory of formation of the solar system explain all the observables?
(Intermediate)
Can two lunar eclipses occur in the same month?
(Advanced)
Considering the motion of the Earth, the solar system, and the galaxy, how fast am I moving while lying in bed asleep?
(Intermediate)
Could there be objects orbiting interior to Mercury?
(Intermediate)
Do asteroids hit the Sun?
(Beginner)
Do the Sun's or Earth's magnetic field reverse?
(Intermediate)
Do we know everything about the Sun?
(Beginner)
Does the Sun have a scientific name?
(Intermediate)
Does the Sun have any heavy elements?
(Beginner)
Does the Sun move around the Milky Way?
(Intermediate)
Does the Sun orbit the Earth as well as the Earth orbiting the Sun?
(Beginner)
Does the Sun rotate?
(Intermediate)
Earth's Bow Shock
(Advanced)
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Is time travel possible? (Beginner)
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What was the bright, smoothly moving star that I saw? (Beginner)
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What are constellations used for? (Intermediate)
How long could life on Earth survive if the Sun stopped shining? (Beginner)
Is the distance from the Earth to the Sun changing? (Advanced)
At what speed does the Earth move around the Sun? (Beginner)
When was the last time all of the planets were aligned? (Beginner)
Does the Mediterranean sea have tides? (Intermediate)
Is time travel possible? (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)
When was the last time all of the planets were aligned? (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)
How far is each planet from Earth? (Intermediate)
How does the location of sunrise and sunset change throughout the year? (Advanced)
What is the difference between a "star" and a "sun"? (Beginner)
Is the distance from the Earth to the Sun changing? (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)
Which planet is most similar to Earth? (Intermediate)
How does the location of sunrise and sunset change throughout the year? (Advanced)
What are constellations used for? (Intermediate)
Why do we not have eclipses every month? (Beginner)
What is the difference between a "star" and a "sun"? (Beginner)
How far is each planet from Earth? (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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