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What kind of interference must astronomers contend with when observing?
(Beginner)
What month was it when Odysseus saw Orion in 1000BC?
(Advanced)
What percent of the time can astronomers observe without interference from the Moon?
(Beginner)
What supernova created the Crab nebula?
(Intermediate)
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What would the Big Crunch look like to an observer on Earth?
(Advanced)
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(Beginner)
What's the object I saw that moved across the sky and then got very bright?
(Beginner)
When can I see the Moon through the hole in the Pantheon?
(Intermediate)
When is the best time to observe zodiacal light?
(Intermediate)
When is the next comet due to arrive?
(Beginner)
When measuring the expansion of the universe, do astronomers consider that they're seeing how galaxies moved long ago, not today?
(Intermediate)
Which hemisphere has the best view of the Milky Way?
(Beginner)
Why can we see the sun's image before sunrise and after sunset?
(Beginner)
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(Intermediate)
Why do planets not twinkle?
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(Beginner)
Why do stars twinkle?
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Why do the size and brightness of the full moon change?
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What color is each planet? (Intermediate)
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Can artificial gravity be created in space? (Intermediate)
What is the significance of the Tropic of Cancer, Tropic of Capricorn, Arctic Circle and Antarctic Circle? (Beginner)
Why do airplanes take longer to fly West than East? (Intermediate)
At what speed does the Earth move around the Sun? (Beginner)
How far is each planet from Earth? (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)
Why can't a plane fly slowly and let the Earth pass underneath? (Beginner)
What is the difference between a "star" and a "sun"? (Beginner)
Can artificial gravity be created in space? (Intermediate)
How do you measure the distance between Earth and the Sun? (Intermediate)
How far is each planet from Earth? (Intermediate)
Why do airplanes take longer to fly West than East? (Intermediate)
How does the position of Moonrise and Moonset change? (Intermediate)
What color is each planet? (Intermediate)
Why do stars twinkle? (Beginner)
What is the difference between a "star" and a "sun"? (Beginner)
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)
Why do airplanes take longer to fly West than East? (Intermediate)
Can artificial gravity be created in space? (Intermediate)
How far is each planet from Earth? (Intermediate)
Why can't a plane fly slowly and let the Earth pass underneath? (Beginner)
Why do the planets orbit 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)
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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