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  1. What's going to happen on December 21st 2012? (viewed 2149150 times)
  2. What color is each planet? (viewed 947970 times)
  3. At what speed does the earth move around the sun? (viewed 614829 times)
  4. Is the Moon moving away from the Earth? When was this discovered? (viewed 590202 times)
  5. How far is each planet from Earth? (viewed 487635 times)
  6. When will Halley's Comet return? (viewed 440335 times)
  7. How long does it take for the Sun's light to reach us? (viewed 403574 times)
  8. Why do the planets orbit the sun? (viewed 398743 times)
  9. How many stars are there in our Galaxy (Milky Way)? (viewed 394930 times)
  10. What is the universe expanding into? (viewed 381152 times)
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