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Planets
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Are Earth and the Moon "twin planets"?
(Beginner)
Are Kuiper Belt Objects asteroids? Are large Kuiper Belt Objects planets?
(Intermediate)
Are the asteroids the remains of a planet which broke apart?
(Beginner)
Are there eclipses on other planets?
(Intermediate)
Can planets collide with one another?
(Intermediate)
Can terrestrial planets have rings?
(Intermediate)
Can the Sun be closer to the Earth than any planet is to Earth?
(Intermediate)
Can the theory of formation of the solar system explain all the observables?
(Intermediate)
Can we colonize other planets?
(Beginner)
Can we hear sound on Titan?
(Intermediate)
Could a planetary system survive if its star merged with another, or if its star went supernova?
(Intermediate)
Could there be objects orbiting interior to Mercury?
(Intermediate)
Could we send a crewed mission to the outer planets?
(Intermediate)
Did the Moon or planets form in a manner similar to that of Earth?
(Beginner)
Do planets radiate noise?
(Beginner)
Do unmanned spacecraft like Voyager travel in straight lines?
(Intermediate)
Have the inner planets cleared their neighborhood?
(Intermediate)
How can I find my age on another planet?
(Beginner)
How can we tell what the interiors of planets are like?
(Advanced)
How do I tell which planet is which?
(Beginner)
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How does the color index of a star relate to its actual color? (Intermediate)
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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)
Why are astronomers interested in gravitational waves? (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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How are light and heavy elements formed? (Advanced)
What color is each planet? (Intermediate)
Can artificial gravity be created in space? (Intermediate)
Why do the planets orbit the sun? (Beginner)
At what speed does the Earth move around the Sun? (Beginner)
Why are the Moon and Sun sometimes orange or red? (Beginner)
Why are there high tides during a Full Moon? (Intermediate)
Are there telescopes that can see the flag and lunar rover on the Moon? (Beginner)
How far is each planet from Earth? (Intermediate)
How does the position of Moonrise and Moonset change? (Intermediate)
How are light and heavy elements formed? (Advanced)
What color is each planet? (Intermediate)
How far is each planet from Earth? (Intermediate)
At what speed does the Earth move around the Sun? (Beginner)
Why do the planets orbit the sun? (Beginner)
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)
How does the location of sunrise and sunset change throughout the year? (Advanced)
Can artificial gravity be created in space? (Intermediate)
Why do stars twinkle? (Beginner)
How are light and heavy elements formed? (Advanced)
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)
Why do the planets orbit the sun? (Beginner)
How do you measure the distance between Earth and the Sun? (Intermediate)
Can artificial gravity be created in space? (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 does the location of sunrise and sunset change throughout the year? (Advanced)
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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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
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