Space Puzzle

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Across
  1. 4. gave the helio-centric model
  2. 5. law that predicts the temperature of the sun
  3. 6. material to build space elevator; stronger than kevlar
  4. 7. age of the universe
  5. 9. space telescope in optical range
  6. 10. prize designed for encouraging space tourism
  7. 14. discovered Uranus
  8. 15. place where most comets exist
  9. 16. Newton's book that suggests space travel
Down
  1. 1. very energetic stellar explosion
  2. 2. Telstar is the first ....... satellite to be in orbit
  3. 3. first space probe to escape sun's gravity
  4. 8. 11.2 m/s
  5. 11. soviet space station
  6. 12. space telescope in X-ray range
  7. 13. number of humans that set foot on other world (moon)