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- How do we know what we observe is x light years away? (Beginner)
- What makes quantum mechanics and general relativity incompatible? (Advanced)
- What are we doing about Space Junk?
- What what a black hole merger look like from a telescope? (Advanced)
- Do galaxy mergers have a major impact on star formation rates within the galaxies? (Intermediate)
- Our universe is still expanding, does that mean things in our daily life are expanding? (Intermediate)
- What was the bright, smoothly moving star that I saw? (Beginner)
- What happened to the Arecibo Telescope? (Beginner)
- Can I buy or name a star? (Beginner)
- 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)
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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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- How do you measure the distance between Earth and the Sun? (Intermediate)
- If gravity isn't a force, how does it accelerate objects? (Advanced)
- What color is each planet? (Intermediate)
- How do the astronauts communicate in space if sound cannot travel in a vacuum? (Beginner)
- Why do the planets orbit the sun? (Beginner)
- Can artificial gravity be created in space? (Intermediate)
- What would happen if the gravity on Earth was suddenly turned off? (Beginner)
- How long could life on Earth survive if the Sun stopped shining? (Beginner)
- Why do we not have eclipses every month? (Beginner)
- Does your weight change between the poles and the equator? (Intermediate)
- Why do the planets orbit the sun? (Beginner)
- What is the difference between a "star" and a "sun"? (Beginner)
- How long could life on Earth survive if the Sun stopped shining? (Beginner)
- How does the location of sunrise and sunset change throughout the year? (Advanced)
- How does the position of Moonrise and Moonset change? (Intermediate)
- What color is each planet? (Intermediate)
- 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 are light and heavy elements formed? (Advanced)
- At what speed does the Earth move around the Sun? (Beginner)
- What is the difference between a "star" and a "sun"? (Beginner)
- Why do the planets orbit the sun? (Beginner)
- How are light and heavy elements formed? (Advanced)
- How do you measure the distance between Earth and the Sun? (Intermediate)
- How long could life on Earth survive if the Sun stopped shining? (Beginner)
- How does the position of Moonrise and Moonset change? (Intermediate)
- How does the location of sunrise and sunset change throughout the year? (Advanced)
- At what speed does the Earth move around the Sun? (Beginner)
- Which planet is most similar to Earth? (Intermediate)
- Are there telescopes that can see the flag and lunar rover on the Moon? (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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