- 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)
- What is the universe expanding into? (Intermediate)
- How does the location of sunrise and sunset change throughout the year? (Advanced)
- What is the difference between a "star" and a "sun"? (Beginner)
- Why do airplanes take longer to fly West than East? (Intermediate)
- Can artificial gravity be created in space? (Intermediate)
- How are light and heavy elements formed? (Advanced)
- How does the position of Moonrise and Moonset change? (Intermediate)
- Can you hear sounds in space? (Beginner)
- What are the names of the earth, moon, sun, and solar system? (Beginner)
- Which planets have rings? (Beginner)
- Why do stars twinkle? (Beginner)
- Is the universe expanding faster than the speed of light? (Intermediate)
- When will Halley's Comet return? (Intermediate)
- How many stars are there in our Galaxy (Milky Way)? (Intermediate)
- Why are the Moon and Sun sometimes orange or red? (Beginner)
- Does the Moon rotate? Are there other moons that always keep one face toward their planet? (Intermediate)
- 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)
- What makes the Earth rotate? (Intermediate)
- What is the physical difference between a star and a planet? (Intermediate)
- How can we see the Milky Way if we are inside it? (Intermediate)
- What is that ring (or rainbow) around the moon? (Beginner)
- What are constellations used for? (Intermediate)
- Does your weight change between the poles and the equator? (Intermediate)
- What are shooting stars? (Beginner)
- What direction do planets rotate? (Beginner)
- Why do all the planets orbit in the same plane? (Intermediate)
- How much money is spent on space exploration? (Intermediate)
- What is a white hole? (Advanced)
- Why can't a plane fly slowly and let the Earth pass underneath? (Beginner)
- What color is Venus? (Beginner)
- What would happen if the gravity on Earth was suddenly turned off? (Beginner)
- Who named the planets and who decides what to name them? (Beginner)
- What are the different kinds of astronomers? (Intermediate)
- Where did the name 'Earth' come from? (Beginner)
- Do stars move in the sky? (Beginner)
- How do I build a model rocket? (Intermediate)
- Why is looking out into space the same as looking back in time? (Beginner)
- Why do planets have elliptical orbits? (Beginner)
- Why is a day divided into 24 hours? (Intermediate)
- Does gravity vary across the surface of the Earth? (Intermediate)
- Why do planets rotate? (Intermediate)
- What is the life cycle of a star? (Intermediate)
- What is the observational difference between a star and a planet? (Beginner)
- Why do we not have eclipses every month? (Beginner)
- What would happen if an asteroid 10 kilometers across hit the Earth? (Beginner)
- How do we know the age of the Universe and the Earth? (Intermediate)
- What are the advantages and disadvantages of using a telescope in space? (Intermediate)
- If photons have zero mass, why do they feel the effects of gravity? (Advanced)
- Which planet is most similar to Earth? (Intermediate)
- What are the requirements for being a planet? (Beginner)
- How can I find the star I have "bought"? (Beginner)
- What is the evidence supporting the nebula theory of Solar System formation? (Intermediate)
- What would happen if we did not have a Moon? (Intermediate)
- Why is the moon in a different place every night? (Beginner)
- How can a star burn with no oxygen? (Beginner)
- What is the largest star? (Beginner)
- How do astronauts take baths and use restrooms in space? (Beginner)
- Does the Sun orbit the Earth as well as the Earth orbiting the Sun? (Beginner)
- What's the difference between astronomy and astrology? (Beginner)
- How many meteorites hit Earth each year? (Intermediate)
- How many Earths fit into the Sun? (Beginner)
- Since Earth is spinning, why do we land in the same place when we jump or fall? (Intermediate)
- What do astronauts eat in space? Can they grow food? (Beginner)
- Does the Moon look different in the northern and southern hemispheres? (Beginner)
- Why is the Universe flat and not spherical? (Advanced)
- Can we feel the Earth spin? (Beginner)
- Why isn't the sky bright at night if the universe has so many stars? (Intermediate)
- Traveling at light speed, how long would it take to get to the nearest galaxy? (Beginner)
- Why do different stars appear with seasons? (Beginner)
- What would happen if you took off your helmet in space? (Beginner)
- What do astronauts do all day in the International Space Station? (Intermediate)
- Does evolution contradict the second law of thermodynamics? (Intermediate)
- How do stars move in the Galaxy? (Intermediate)
- What is a nova? (Beginner)
- What are some of the effects of solar flares on Earth? (Intermediate)
- How do we weigh objects in space? (Beginner)
- Is there a proof that Earth moves? (Intermediate)
- How are elements heavier than iron formed? (Intermediate)
- What can we learn from the color of a star? (Intermediate)
- Why hasn't NASA gone back to the moon? (Beginner)
- How does the Sun compare to other stars? (Beginner)
- How do the astronauts communicate in space if sound cannot travel in a vacuum? (Beginner)
- Can we find the place where the Big Bang happened? (Intermediate)
- Does the Sun have a scientific name? (Intermediate)
- If gravity isn't a force, how does it accelerate objects? (Advanced)
- What time is sunrise/sunset or moonrise/moonset at my location? (Beginner)
- What happens when galaxies collide? (Beginner)
- Does the Mediterranean sea have tides? (Intermediate)
- Why are there high tides during a Full Moon? (Intermediate)
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