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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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But seriously: what was there before the Big Bang? (Beginner)
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What is the universe expanding into? (Intermediate)
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If the universe is 13.8 billion years old, how can it be larger than 13.8 billion light years across? (Advanced)
Why do planets have elliptical orbits? (Beginner)
How much does the Earth "wobble" on its orbit due to the Moon's gravity? (Intermediate)
But seriously: what was there before the Big Bang? (Beginner)
Why do rays from Sun appear to converge at a point? (Beginner)
Why is the sun red? During sunset, Northeastern US, Summer 2021 (Beginner)
How does the position of Moonrise and Moonset change? (Intermediate)
Are there telescopes that can see the flag and lunar rover on the Moon? (Beginner)
How far can photons move freely in the early universe (Advanced)
How likely is it that the Solar System has had or will have a close encounter with another star? (Intermediate)
How do you measure the distance between Earth and the Sun? (Intermediate)
What is the difference between a "star" and a "sun"? (Beginner)
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)
Why do the planets orbit the sun? (Beginner)
How does the position of Moonrise and Moonset change? (Intermediate)
But seriously: what was there before the Big Bang? (Beginner)
At what speed does the Earth move around the Sun? (Beginner)
How much does the Earth "wobble" on its orbit due to the Moon's gravity? (Intermediate)
How are light and heavy elements formed? (Advanced)
Is the Moon moving away from the Earth? When was this discovered? (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 the planets orbit the sun? (Beginner)
How long could life on Earth survive if the Sun stopped shining? (Beginner)
How does the position of Moonrise and Moonset change? (Intermediate)
Are there telescopes that can see the flag and lunar rover on the Moon? (Beginner)
Why is the moon in a different place every night? (Beginner)
At what speed does the Earth move around the Sun? (Beginner)
How are light and heavy elements formed? (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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The Milky Way
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Physics
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The Theory of Relativity
People & Astronomy
Careers in Astronomy
Space Exploration & Astronauts
The History of Astronomy
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