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!What calculations go into predicting eclipses?
(Advanced)
Can two lunar eclipses occur in the same month?
(Advanced)
Can we look back in time and see our galaxy forming?
(Intermediate)
Can we make a movie of the Milky Way galaxy's rotation?
(Beginner)
Can you tell time by the Big Dipper?
(Beginner)
Could someone travel the universe in his or her own lifetime?
(Beginner)
Could we be seeing dead stars?
(Beginner)
Did time go slower just after the Big Bang?
(Advanced)
Do we have to worry about relativity when studying galactic objects?
(Intermediate)
Do we really observe the edges of galaxies at different epochs?
(Advanced)
How can I calculate the position or path of the Sun for a given time and location?
(Intermediate)
How can I watch the Perseid meteor shower?
(Beginner)
How do I maximize my chances of seeing shooting stars?
(Intermediate)
How do sunrise and sunset times change with altitude?
(Intermediate)
How is the time of sunrise calculated?
(Intermediate)
How long does it take for the Sun's light to reach us?
(Beginner)
If clocks run slow in a gravitational field, how can we know the true age of the Solar System and Universe?
(Intermediate)
If Mars is only about 35-60 million miles away at close approach, why does it take 6-8 months to get there?
(Intermediate)
If the Earth's rotation period is less than 24 hours, why don't our clocks fall out of sync with the Sun?
(Intermediate)
If the Universe was infinitely dense at the Big Bang, why didn't time stand still?
(Beginner)
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What color is each planet? (Intermediate)
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When was the last time all of the planets were aligned? (Beginner)
How far is each planet from Earth? (Intermediate)
What is the difference between a "star" and a "sun"? (Beginner)
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What color is each planet? (Intermediate)
Why are the Moon and Sun sometimes orange or red? (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)
What is the difference between a "star" and a "sun"? (Beginner)
How far is each planet from Earth? (Intermediate)
Why do airplanes take longer to fly West than East? (Intermediate)
How do you measure the distance between Earth and the Sun? (Intermediate)
Can artificial gravity be created in space? (Intermediate)
At what speed does the Earth move around the Sun? (Beginner)
What color is each planet? (Intermediate)
Why are the Moon and Sun sometimes orange or red? (Beginner)
When was the last time all of the planets were aligned? (Beginner)
What is the significance of the Tropic of Cancer, Tropic of Capricorn, Arctic Circle and Antarctic Circle? (Beginner)
What is the difference between a "star" and a "sun"? (Beginner)
How far is each planet from Earth? (Intermediate)
Why do airplanes take longer to fly West than East? (Intermediate)
How do you measure the distance between Earth and the Sun? (Intermediate)
How does the position of Moonrise and Moonset change? (Intermediate)
Can artificial gravity be created in space? (Intermediate)
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)
How long does it take for the Sun's light to reach us? (Beginner)
What is the significance of the Tropic of Cancer, Tropic of Capricorn, Arctic Circle and Antarctic Circle? (Beginner)
What is the universe expanding into? (Intermediate)
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