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Can I build an instrument to measure the size of the Sun and of the Moon? (Intermediate)
Did the Sumerians measure precession? (Intermediate)
Has there been an experiment that measured speed faster than the speed of light in vacuum? (Advanced)
How can I calculate distances between stars? (Advanced)
How can I measure the distance of a star? (Beginner)
How can we measure distances to more stars? (Intermediate)
How did a transit of Venus provide astronomers with the first measurement of the Earth-Sun distance? (Intermediate)
How do astronomers measure the brightness of stars? (Intermediate)
How do astronomers measure the radius of a star? (Intermediate)
How do we define distance in an expanding universe? (Intermediate)
How do we know what other planets (and stars, galaxies, etc.) are made of? (Intermediate)
How do we know what parameters to use when simulating the collision of the Milky Way and Andromeda? (Advanced)
How do we measure distances to other stars? (Beginner)
How do we measure the size of the Moon and of the Sun? (Beginner)
How do you measure a planet's mass? (Beginner)
How do you measure the distance between Earth and the Sun? (Intermediate)
How do you measure the mass of a star? (Beginner)
How does the brightness of a star depend on its distance from us? (Beginner)
Is it possible to measure the temperature of the Sun? (Beginner)
What is apparent magnitude? (Intermediate)

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What would happen if an asteroid 10 kilometers across hit the Earth? (Beginner)
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Are there telescopes that can see the flag and lunar rover on the Moon? (Beginner)
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How long could life on Earth survive if the Sun stopped shining? (Beginner)
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But seriously: what was there before the Big Bang? (Beginner)
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Is speed of light the same everywhere ? (Beginner)

What would happen if an asteroid 10 kilometers across hit the Earth? (Beginner)
How do you measure the distance between Earth and the Sun? (Intermediate)
How can we see the Milky Way if we are inside it? (Intermediate)
How long could life on Earth survive if the Sun stopped shining? (Beginner)
Are there telescopes that can see the flag and lunar rover on the Moon? (Beginner)
What is the difference between a "star" and a "sun"? (Beginner)
Why do the planets orbit the sun? (Beginner)
At what speed does the Earth move around the Sun? (Beginner)
How does the position of Moonrise and Moonset change? (Intermediate)
Why are there high tides during a Full Moon? (Intermediate)

What's going to happen on December 21st 2012? (Intermediate)
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At what speed does the Earth move around the Sun? (Beginner)
How far is each planet from Earth? (Intermediate)
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Why do the planets orbit the sun? (Beginner)
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