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- 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)
- Can two galaxies move away from each other faster than the speed of light? (Intermediate)
- What is a graviton? (Intermediate)
- Why are there high tides during a Full Moon? (Intermediate)
- Why is Neptune still considered a planet when Pluto crosses its orbit? (Intermediate)
- Could there be objects orbiting interior to Mercury? (Intermediate)
- Have the inner planets cleared their neighborhood? (Intermediate)
- What caused the Big Bang and created the Universe? (Beginner)
- If spacetime is curved, is it possible for us to look into space and see light from Earth from long ago? (Intermediate)
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- What should I know about the upcoming Solar Eclipse? (2017)
- 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)
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- Which planets have rings? (Beginner)
- Are there any asteroids on a collision course with Earth? (Beginner)
- How much money is spent on space exploration? (Intermediate)
- Since Earth is spinning, why do we land in the same place when we jump or fall? (Intermediate)
- Why do astronomers use telescopes? (Beginner)
- How do astronauts communicate with their families from space? (Beginner)
- How critical is the Earth-Sun distance in maintaining our average temperatures on Earth? (Intermediate)
- Why does the Sun's apparent path through the sky change throughout the year? (Beginner)
- What caused the Big Bang and created the Universe? (Beginner)
- How fast does the Earth go at perihelion and aphelion? (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)
- Are there telescopes that can see the flag and lunar rover on the Moon? (Beginner)
- Is the distance from the Earth to the Sun changing? (Advanced)
- How far is each planet from Earth? (Intermediate)
- Can artificial gravity be created in space? (Intermediate)
- What is the difference between a "star" and a "sun"? (Beginner)
- How do you measure the distance between Earth and the Sun? (Intermediate)
- At what speed does the Earth move around the Sun? (Beginner)
- Can moons have moons? (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)
- How far is each planet from Earth? (Intermediate)
- Can artificial gravity be created in space? (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 airplanes take longer to fly West than East? (Intermediate)
- At what speed does the Earth move around the Sun? (Beginner)
- When was the last time all of the planets were aligned? (Beginner)
- Which planets have rings? (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)
- How long does it take for the Sun's light to reach us? (Beginner)
- When was the last time all of the planets were aligned? (Beginner)
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