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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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What kind of interference must astronomers contend with when observing? (Beginner)
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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)
If spacetime is curved, is it possible for us to look into space and see light from Earth from long ago? (Intermediate)
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What should I know about the upcoming Solar Eclipse? (2017)
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What color is each planet? (Intermediate)
What is the significance of the Tropic of Cancer, Tropic of Capricorn, Arctic Circle and Antarctic Circle? (Beginner)
At what speed does the Earth move around the Sun? (Beginner)
How far is each planet from Earth? (Intermediate)
Is the distance from the Earth to the Sun changing? (Advanced)
Can artificial gravity be created in space? (Intermediate)
Can moons have moons? (Intermediate)
What is the difference between a "star" and a "sun"? (Beginner)
When was the last time all of the planets were aligned? (Beginner)
How do you measure the distance between Earth and the Sun? (Intermediate)
What color is each planet? (Intermediate)
Can moons have moons? (Intermediate)
What is the significance of the Tropic of Cancer, Tropic of Capricorn, Arctic Circle and Antarctic Circle? (Beginner)
How far is each planet from Earth? (Intermediate)
Can artificial gravity be created in space? (Intermediate)
How do you measure the distance between Earth and the Sun? (Intermediate)
What is the difference between a "star" and a "sun"? (Beginner)
At what speed does the Earth move around the Sun? (Beginner)
Is the distance from the Earth to the Sun changing? (Advanced)
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)
How far is each planet from Earth? (Intermediate)
Can artificial gravity be created in space? (Intermediate)
What is the difference between a "star" and a "sun"? (Beginner)
How do you measure the distance between Earth and the Sun? (Intermediate)
Why do airplanes take longer to fly West than East? (Intermediate)
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 the planets orbit the 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)
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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Physics
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The History of Astronomy
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