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The Moon
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When will humans travel to Mars and revisit the Moon?
(Intermediate)
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 Earth and the Moon "twin planets"?
(Beginner)
Are there any new craters on the Moon?
(Intermediate)
Are there solar tides?
(Beginner)
Are there telescopes that can see the flag and lunar rover on the Moon?
(Beginner)
Can a lunar and a solar eclipse happen in the same month? When will this happen next?
(Intermediate)
Can astronomers observe anything when the moon is full?
(Beginner)
Can I build an instrument to measure the size of the Sun and of the Moon?
(Intermediate)
Can I buy land on the Moon?
(Intermediate)
Can moons have moons?
(Intermediate)
Can other terrestrial moons be (or have been) stable?
(Advanced)
Can two lunar eclipses occur in the same month?
(Advanced)
Can we prove that the Moon isn't hollow?
(Intermediate)
Can you fire a gun on the Moon?
(Intermediate)
Did astronauts really go to the Moon, or is it a hoax?
(Beginner)
Did I find a rock that came from the Moon?
(Beginner)
Did the Moon or planets form in a manner similar to that of Earth?
(Beginner)
Do asteroids ever do anything good in the Solar System?
(Beginner)
Does lunar gardening really work?
(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)
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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)
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Can we find the place where the Big Bang happened? (Intermediate)
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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)
Does the Mediterranean sea have tides? (Intermediate)
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How can we see the Milky Way if we are inside it? (Intermediate)
Is it possible for amateurs to do optical interferometry? (Intermediate)
Earth's Bow Shock (Advanced)
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)
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)
Earth's Bow Shock (Advanced)
Which planet is most similar to Earth? (Intermediate)
At what speed does the Earth move around the Sun? (Beginner)
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Why do the planets orbit the sun? (Beginner)
Are there telescopes that can see the flag and lunar rover on the Moon? (Beginner)
How are light and heavy elements formed? (Advanced)
How do you measure the distance between Earth and the Sun? (Intermediate)
What was the bright, smoothly moving star that I saw? (Beginner)
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)
What would happen if the Moon fell out of its orbit around Earth? (Intermediate)
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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Home
Our Solar System
The Earth
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The Sun
Planets & Dwarf Planets
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The Universe
Extrasolar Planets
Stars & Star Clusters
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The Milky Way
Galaxies
Cosmology & the Big Bang
Observational Astronomy
Stargazing
Telescopes
Lunar & Solar Eclipses
Timekeeping
SETI & Extraterrestrial Life
Physics
General Physics
The Theory of Relativity
People & Astronomy
Careers in Astronomy
Space Exploration & Astronauts
The History of Astronomy
Astronomy in the Arts