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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 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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How can we see the Milky Way if we are inside it? (Intermediate)
How do you measure the distance between Earth and the Sun? (Intermediate)
What would happen if an asteroid 10 kilometers across hit the Earth? (Beginner)
Why do the planets orbit the sun? (Beginner)
How long could life on Earth survive if the Sun stopped shining? (Beginner)
Are there telescopes that can see the flag and lunar rover on the Moon? (Beginner)
How can the universe be "flat"? We're 3D! (Beginner)
Is the universe expanding faster than the speed of light? (Intermediate)
How are light and heavy elements formed? (Advanced)
But seriously: what was there before the Big Bang? (Beginner)
How can we see the Milky Way if we are inside it? (Intermediate)
How do you measure the distance between Earth and the Sun? (Intermediate)
What would happen if an asteroid 10 kilometers across hit the Earth? (Beginner)
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)
Why do the planets orbit the sun? (Beginner)
How does the position of Moonrise and Moonset change? (Intermediate)
At what speed does the Earth move around the Sun? (Beginner)
What is the difference between a "star" and a "sun"? (Beginner)
Why is Earth's core molten? (Intermediate)
What would happen if an asteroid 10 kilometers across hit the Earth? (Beginner)
How do you measure the distance between Earth and the Sun? (Intermediate)
How can we see the Milky Way if we are inside it? (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)
What is the difference between a "star" and a "sun"? (Beginner)
Why do the planets orbit the sun? (Beginner)
How does the position of Moonrise and Moonset change? (Intermediate)
At what speed does the Earth move around the Sun? (Beginner)
But seriously: what was there before the Big Bang? (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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