Astronomy History

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Across
  1. 2. What planet spins backwards?
  2. 4. What planet is the coldest?
  3. 6. Our galaxy is called what?
  4. 9. Saturn, Jupiter,Neptune,Uranus are known as what?
  5. 10. Which planet has rings ?
  6. 11. The biggest star?
Down
  1. 1. On this planet a day is twice as long as a year?
  2. 3. How long would it take to fly a plane to Pluto?
  3. 5. Black holes give off what?
  4. 6. What is getting farther away every year?
  5. 7. Which planet is not named after a god?
  6. 8. 153.6 hours is what on Pluto?