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  1. What's going to happen on December 21st 2012? (viewed 2132237 times)
  2. What color is each planet? (viewed 912343 times)
  3. At what speed does the earth move around the sun? (viewed 585126 times)
  4. Is the Moon moving away from the Earth? When was this discovered? (viewed 564226 times)
  5. How far is each planet from Earth? (viewed 469517 times)
  6. When will Halley's Comet return? (viewed 425724 times)
  7. How long does it take for the Sun's light to reach us? (viewed 390688 times)
  8. How many stars are there in our Galaxy (Milky Way)? (viewed 388460 times)
  9. Why do the planets orbit the sun? (viewed 379600 times)
  10. What is the universe expanding into? (viewed 370952 times)
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