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- If I were hypothetically wearing a spacesuit and sitting on one of the Voyager space probes at their current positions in space, how much light would I have? (Intermediate)
- What makes certain lunar eclipses so special? (Beginner)
- Why is Earth's core molten? (Intermediate)
- What will happen to Earth's tides as the moon moves away from us? (Intermediate)
- How can spiral galaxies keep their shape? (Advanced)
- Does a black hole have a "surface"? (Intermediate)
- How can you link telescopes to make a bigger "effective telescope"? (Intermediate)
- What should I know about the upcoming Solar Eclipse (2017)? (Beginner)
- Do galaxies that are receding from us faster than the speed of light disappear from our observations? (Intermediate)
- Why are astronomers interested in gravitational waves? (Intermediate)
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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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- Why are there both high and low tides? (Intermediate)
- What are the names of the earth, moon, sun, and solar system? (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)
- What is the significance of the Tropic of Cancer, Tropic of Capricorn, Arctic Circle and Antarctic Circle? (Beginner)
- Is the distance from the Earth to the Sun changing? (Advanced)
- 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 is twilight short near the equator? (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)
- At what speed does the Earth move around the Sun? (Beginner)
- Why do the planets orbit the sun? (Beginner)
- How far is each planet from Earth? (Intermediate)
- Why are the Moon and Sun sometimes orange or red? (Beginner)
- Why do stars twinkle? (Beginner)
- How do you measure the distance between Earth and the Sun? (Intermediate)
- What are the requirements for being a planet? (Beginner)
- Is the distance from the Earth to the Sun changing? (Advanced)
- What color is each planet? (Intermediate)
- At what speed does the Earth move around the Sun? (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 the planets orbit 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)
- What would happen if an asteroid 10 kilometers across hit the Earth? (Beginner)
- What is the difference between a "star" and a "sun"? (Beginner)
- Why do stars twinkle? (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)
- 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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