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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 can we distinguish a star's "real" color from the change in color that we observe due to the star's motion? (Intermediate)
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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)
Why are astronomers interested in gravitational waves? (Intermediate)
Can two galaxies move away from each other faster than the speed of light? (Intermediate)
What is a graviton? (Intermediate)
Why are there high tides during a Full Moon? (Intermediate)
Why is Neptune still considered a planet when Pluto crosses its orbit? (Intermediate)
Could there be objects orbiting interior to Mercury? (Intermediate)
Have the inner planets cleared their neighborhood? (Intermediate)
What caused the Big Bang and created the Universe? (Beginner)
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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)
Are there telescopes that can see the flag and lunar rover on the Moon? (Beginner)
Why do airplanes take longer to fly West than East? (Intermediate)
Can artificial gravity be created in space? (Intermediate)
What is the difference between a "star" and a "sun"? (Beginner)
Why do stars twinkle? (Beginner)
What is the significance of the Tropic of Cancer, Tropic of Capricorn, Arctic Circle and Antarctic Circle? (Beginner)
Why can't a plane fly slowly and let the Earth pass underneath? (Beginner)
At what speed does the Earth move around the Sun? (Beginner)
When was the last time all of the planets were aligned? (Beginner)
What color is each planet? (Intermediate)
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)
How far is each planet from Earth? (Intermediate)
Can artificial gravity be created in space? (Intermediate)
Are there telescopes that can see the flag and lunar rover on the Moon? (Beginner)
Why do stars twinkle? (Beginner)
Why do airplanes take longer to fly West than East? (Intermediate)
Why do the planets orbit the sun? (Beginner)
At what speed does the Earth move around the Sun? (Beginner)
What color is each planet? (Intermediate)
What is the difference between a "star" and a "sun"? (Beginner)
What is the significance of the Tropic of Cancer, Tropic of Capricorn, Arctic Circle and Antarctic Circle? (Beginner)
Are there telescopes that can see the flag and lunar rover on the Moon? (Beginner)
How far is each planet from Earth? (Intermediate)
Can artificial gravity be created in space? (Intermediate)
Why do stars twinkle? (Beginner)
When was the last time all of the planets were aligned? (Beginner)
At what speed does the Earth move around the Sun? (Beginner)
Why do airplanes take longer to fly West than East? (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)
How long does it take for the Sun's light to reach us? (Beginner)
When was the last time all of the planets were aligned? (Beginner)
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Home
Our Solar System
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The Universe
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The Milky Way
Galaxies
Cosmology & the Big Bang
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Telescopes
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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