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How do the astronauts communicate in space if sound cannot travel in a vacuum?
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Can astronauts play musical instruments in space?
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Can we hear sound on Titan?
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Can you hear sounds in space?
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Did I really hear a meteor?
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Do planets radiate noise?
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How can we see galaxies if their stars are so faint? (Intermediate)
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Is speed of light the same everywhere ? (Beginner)
How does Venus have sulphuric acid in it's clouds? (Beginner)
Earth's Bow Shock (Advanced)
How much does the Earth "wobble" on its orbit due to the Moon's gravity? (Intermediate)
Why is the sun red? During sunset, Northeastern US, Summer 2021 (Beginner)
Why do rays from Sun appear to converge at a point? (Beginner)
But seriously: what was there before the Big Bang? (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 we know what we observe is x light years away? (Beginner)
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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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Is speed of light the same everywhere ? (Beginner)
Is the Moon always visible during winter on the North Pole? (Intermediate)
If spacetime is curved, is it possible for us to look into space and see light from Earth from long ago? (Intermediate)
What makes quantum mechanics and general relativity incompatible? (Advanced)
What elements make up the Sun? (Beginner)
The Moon slows the Earth's rotation, but how fast was it spinning billions of years ago? (Intermediate)
Is the Earth at the centre of the Universe? (Intermediate)
Who (and when) discovered that the earth's axis is on a 23 degree tilt? (Intermediate)
Was Stonehenge built to mark solar phenomena? (Intermediate)
What would happen if Earth had more than one 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 do you measure the distance between Earth and the Sun? (Intermediate)
Which planet is most similar to Earth? (Intermediate)
Why is the moon in a different place every night? (Beginner)
Why do the planets orbit the sun? (Beginner)
How can the Universe expand faster than the speed of light during inflation? (Advanced)
How long could life on Earth survive if the Sun stopped shining? (Beginner)
Why do we not have eclipses every month? (Beginner)
At what speed does the Earth move around the Sun? (Beginner)
Are there telescopes that can see the flag and lunar rover on the Moon? (Beginner)
How do you measure the distance between Earth and the Sun? (Intermediate)
How far is each planet from Earth? (Intermediate)
Why is the moon in a different place every night? (Beginner)
How does the position of Moonrise and Moonset change? (Intermediate)
Which planet is most similar to Earth? (Intermediate)
Why do the planets orbit the sun? (Beginner)
Why do we not have eclipses every month? (Beginner)
What was the bright, smoothly moving star that I saw? (Beginner)
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)
How do you measure the distance between Earth and the Sun? (Intermediate)
Is the Moon moving away from the Earth? When was this discovered? (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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