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Have gravitational waves been proven to exist?
(Intermediate)
Have the inner planets cleared their neighborhood?
(Intermediate)
How big a change in the Earth's orbit would be required to destroy all life?
(Intermediate)
How can I find my age on another planet?
(Beginner)
How can I find the distance to the Sun on any given day?
(Advanced)
How can two moons of Saturn share the same orbit?
(Intermediate)
How do planets capture satellites?
(Advanced)
How do you measure a planet's mass?
(Beginner)
How do you measure the distance between Earth and the Sun?
(Intermediate)
How does libration allow us to see more than 50% of the Moon?
(Advanced)
How far is each planet from Earth?
(Intermediate)
How fast does the Earth go at perihelion and aphelion?
(Intermediate)
How long does a solar eclipse last?
(Beginner)
How often does the Sun pass through a spiral arm in the Milky Way?
(Intermediate)
If Mars is only about 35-60 million miles away at close approach, why does it take 6-8 months to get there?
(Intermediate)
Is the distance from the Earth to the Sun changing?
(Advanced)
Is the Moon always visible during winter on the North Pole?
(Intermediate)
Is the Moon moving away from the Earth? When was this discovered?
(Intermediate)
Is there a proof that Earth moves?
(Intermediate)
Is there a simple formula to calculate solar eclipse timings from any position on Earth?
(Intermediate)
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The Moon and Sun are the same apparent size in the sky. The Moon is moving away from us at 3.8 centimeters/year. Isn't it improbable that we live in an epoch in which they appear the same size in the sky? (Beginner)
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Do galaxies that are receding from us faster than the speed of light disappear from our observations? (Intermediate)
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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)
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Have the inner planets cleared their neighborhood? (Intermediate)
What caused the Big Bang and created the Universe? (Beginner)
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What should I know about the upcoming Solar Eclipse? (2017)
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What color is each planet? (Intermediate)
If gravity is a "curvature of space" rather than a force, why do a ball and bullet follow different paths? (Intermediate)
Does your weight change between the poles and the equator? (Intermediate)
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)
What is the difference between a "star" and a "sun"? (Beginner)
Why do airplanes take longer to fly West than East? (Intermediate)
How far is each planet from Earth? (Intermediate)
How long does it take for the Sun's light to reach us? (Beginner)
How do you measure the distance between Earth and the Sun? (Intermediate)
Why is Neptune still considered a planet when Pluto crosses its orbit? (Intermediate)
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)
What is the difference between a "star" and a "sun"? (Beginner)
Does your weight change between the poles and the equator? (Intermediate)
Why do airplanes take longer to fly West than East? (Intermediate)
How do you measure the distance between Earth and the Sun? (Intermediate)
When was the last time all of the planets were aligned? (Beginner)
Is the distance from the Earth to the Sun changing? (Advanced)
What color is each planet? (Intermediate)
Why is Neptune still considered a planet when Pluto crosses its orbit? (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)
What is the difference between a "star" and a "sun"? (Beginner)
Why do airplanes take longer to fly West than East? (Intermediate)
How do you measure the distance between Earth and the Sun? (Intermediate)
When was the last time all of the planets were aligned? (Beginner)
Can artificial gravity be created in space? (Intermediate)
At what speed does the Earth move around 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)
How long does it take for the Sun's light to reach us? (Beginner)
What is the universe expanding into? (Intermediate)
What is the significance of the Tropic of Cancer, Tropic of Capricorn, Arctic Circle and Antarctic Circle? (Beginner)
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