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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)
How are galaxies and solar systems similar?
(Advanced)
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Where, in relation to the entire universe, is the Milky Way located? (Intermediate)
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What what a black hole merger look like from a telescope? (Advanced)
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Our universe is still expanding, does that mean things in our daily life are expanding? (Intermediate)
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Can I buy or name a star? (Beginner)
If I were hypothetically wearing a spacesuit and sitting on one of the Voyager space probes at their current positions in space, how much light would I have? (Intermediate)
What makes certain lunar eclipses so special? (Beginner)
Why is Earth's core molten? (Intermediate)
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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 do planets rotate? (Intermediate)
Does the Sun have a scientific name? (Intermediate)
How long does the supernova stage of a star last? (Intermediate)
Is the speed of light constant? (Beginner)
Does quantum entanglement imply faster than light communication? (Intermediate)
How long would it take the Earth to fall into the Sun? (Intermediate)
What is the mass of the Universe? (Intermediate)
How do you measure a planet's mass? (Beginner)
How does the position of Moonrise and Moonset change? (Intermediate)
Can terrestrial planets have rings? (Intermediate)
What is the difference between a "star" and a "sun"? (Beginner)
How do you measure the distance between Earth and the Sun? (Intermediate)
Which planet is most similar to Earth? (Intermediate)
How long could life on Earth survive if the Sun stopped shining? (Beginner)
Why do the planets orbit 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 color is each planet? (Intermediate)
At what speed does the Earth move around the Sun? (Beginner)
How does the position of Moonrise and Moonset change? (Intermediate)
How do you measure the distance between Earth and the Sun? (Intermediate)
What is the difference between a "star" and a "sun"? (Beginner)
How long could life on Earth survive if the Sun stopped shining? (Beginner)
How are light and heavy elements formed? (Advanced)
Why do the planets orbit the sun? (Beginner)
Which planet is most similar to Earth? (Intermediate)
At what speed does the Earth move around the Sun? (Beginner)
What color is each planet? (Intermediate)
Are there telescopes that can see the flag and lunar rover on the Moon? (Beginner)
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)
Is the Moon moving away from the Earth? When was this discovered? (Intermediate)
How do you measure the distance between Earth and the Sun? (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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