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How do we weigh objects in space?
(Beginner)
How do you calculate the lifetime of the Sun?
(Advanced)
How do you measure a planet's mass?
(Beginner)
How do you measure the mass of a star?
(Beginner)
How does a star take mass from another star?
(Intermediate)
How does the Sun compare to other stars?
(Beginner)
How far does a galaxy extend?
(Intermediate)
How many stars are there in our Galaxy (Milky Way)?
(Intermediate)
If gravity is a "curvature of space" rather than a force, why do a ball and bullet follow different paths?
(Intermediate)
If gravity isn't a force, how does it accelerate objects?
(Advanced)
If light has no mass, then what draws it into a black hole?
(Intermediate)
If photons have zero mass, why do they feel the effects of gravity?
(Advanced)
Is it true that the Sun burns off a billion tons of gas every 5 seconds?
(Beginner)
Is light of different colors affected differently by gravity?
(Intermediate)
Is the Earth slowly getting larger?
(Beginner)
Is the Moon hollow?
(Intermediate)
Is time travel possible?
(Beginner)
What are "blue stragglers" in globular clusters?
(Intermediate)
What are the requirements for being a planet?
(Beginner)
What causes a particle to decay?
(Intermediate)
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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)
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What color is each planet? (Intermediate)
Which planets have rings? (Beginner)
Why are there high tides during a Full Moon? (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 position of Moonrise and Moonset change? (Intermediate)
Can artificial gravity be created in space? (Intermediate)
Is the Moon moving away from the Earth? When was this discovered? (Intermediate)
Why do stars twinkle? (Beginner)
Are there telescopes that can see the flag and lunar rover on the Moon? (Beginner)
What color is each planet? (Intermediate)
Can artificial gravity be created in space? (Intermediate)
What is the difference between a "star" and a "sun"? (Beginner)
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 far is each planet from Earth? (Intermediate)
Why do airplanes take longer to fly West than East? (Intermediate)
At what speed does the Earth move around the Sun? (Beginner)
Why do stars twinkle? (Beginner)
Why do the planets orbit 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)
Can artificial gravity be created in space? (Intermediate)
How far is each planet from Earth? (Intermediate)
Why do stars twinkle? (Beginner)
At what speed does the Earth move around the Sun? (Beginner)
Why do airplanes take longer to fly West than East? (Intermediate)
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 Theory of Relativity
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