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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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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)
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What is the universe expanding into? (Intermediate)
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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)
Are there telescopes that can see the flag and lunar rover on the Moon? (Beginner)
How long could life on Earth survive if the Sun stopped shining? (Beginner)
Is it possible for amateurs to do optical interferometry? (Intermediate)
Earth's Bow Shock (Advanced)
How can we see the Milky Way if we are inside it? (Intermediate)
What kind of eyepieces do I need to look at planets? (Intermediate)
At what speed does the Earth move around the Sun? (Beginner)
How do you measure the distance between Earth and the Sun? (Intermediate)
What was the bright, smoothly moving star that I saw? (Beginner)
Are there telescopes that can see the flag and lunar rover on the Moon? (Beginner)
How far is each planet from Earth? (Intermediate)
What would happen if the Moon fell out of its orbit around Earth? (Intermediate)
Earth's Bow Shock (Advanced)
How do you measure the distance between Earth and the Sun? (Intermediate)
Which planet is most similar to Earth? (Intermediate)
Why do the planets orbit the sun? (Beginner)
At what speed does the Earth move around the Sun? (Beginner)
How are light and heavy elements formed? (Advanced)
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 do you measure the distance between Earth and the Sun? (Intermediate)
Which planet is most similar to Earth? (Intermediate)
How far is each planet from 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)
How are light and heavy elements formed? (Advanced)
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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