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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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How does libration allow us to see more than 50% of the Moon? (Advanced)
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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)
What will happen to Earth's tides as the moon moves away from us? (Intermediate)
How can spiral galaxies keep their shape? (Advanced)
Does a black hole have a "surface"? (Intermediate)
How can you link telescopes to make a bigger "effective telescope"? (Intermediate)
What should I know about the upcoming Solar Eclipse (2017)? (Beginner)
Do galaxies that are receding from us faster than the speed of light disappear from our observations? (Intermediate)
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What is the universe expanding into? (Intermediate)
What do I need to do to become an astronomer? (Beginner)
What's the difference between astronomy and astrology? (Beginner)
Why is looking out into space the same as looking back in time? (Beginner)
Can we find the place where the Big Bang happened? (Intermediate)
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What color is each planet? (Intermediate)
Why do airplanes take longer to fly West than East? (Intermediate)
Why do the planets orbit the sun? (Beginner)
How does the position of Moonrise and Moonset change? (Intermediate)
Are there telescopes that can see the flag and lunar rover on the Moon? (Beginner)
Why are the Moon and Sun sometimes orange or red? (Beginner)
At what speed does the Earth move around the Sun? (Beginner)
What is that ring (or rainbow) around the moon? (Beginner)
How far is each planet from Earth? (Intermediate)
How are light and heavy elements formed? (Advanced)
What color is each planet? (Intermediate)
Can artificial gravity be created in space? (Intermediate)
How are light and heavy elements formed? (Advanced)
At what speed does the Earth move around the Sun? (Beginner)
Why do the planets orbit the sun? (Beginner)
How far is each planet from Earth? (Intermediate)
What are constellations used for? (Intermediate)
Are there telescopes that can see the flag and lunar rover on the Moon? (Beginner)
What is the significance of the Tropic of Cancer, Tropic of Capricorn, Arctic Circle and Antarctic Circle? (Beginner)
How do you measure the distance between Earth and the Sun? (Intermediate)
What color is each planet? (Intermediate)
How are light and heavy elements formed? (Advanced)
Can artificial gravity be created in space? (Intermediate)
At what speed does the Earth move around the Sun? (Beginner)
Why do the planets orbit the sun? (Beginner)
How far is each planet from Earth? (Intermediate)
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)
What is the significance of the Tropic of Cancer, Tropic of Capricorn, Arctic Circle and Antarctic Circle? (Beginner)
What is the difference between a "star" and a "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)
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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Our Solar System
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SETI & Extraterrestrial Life
Physics
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The Theory of Relativity
People & Astronomy
Careers in Astronomy
Space Exploration & Astronauts
The History of Astronomy
Astronomy in the Arts