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Is light blueshifted when it is gravitationally lensed?
(Intermediate)
What would the Big Crunch look like to an observer on Earth?
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Why are there blue shifted galaxies?
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When was the last time all of the planets were aligned? (Beginner)
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How do you measure the distance between Earth and the Sun? (Intermediate)
At what speed does the Earth move around the Sun? (Beginner)
How far is each planet from Earth? (Intermediate)
How are light and heavy elements formed? (Advanced)
What is the difference between a "star" and a "sun"? (Beginner)
How does the location of sunrise and sunset change throughout the year? (Advanced)
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How far is each planet from Earth? (Intermediate)
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What is the universe expanding into? (Intermediate)
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