The solar system and the space

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Across
  1. 2. Which planet was named after the Roman god of war?
  2. 3. The name for the whole of space and everything in it is the what?
  3. 6. What is a very large sphere of rock or gas that orbits a star?
  4. 8. What is the planet after Uranus?
  5. 9. A what is the distance light travels in one year?
  6. 12. What is the planet after mercury?
  7. 14. system Our what means the sun and all the object in orbit around the sun?
  8. 16. Way Our solar system is found in which galaxy?
  9. 17. hemisphere Australia is in which hemisphere?
  10. 18. planet A what is a large, round object that orbits a star but is not big enough to clear its orbital path of other debris?
Down
  1. 1. hemisphere Canada is in which hemisphere?
  2. 2. Which planet is closet to the sun?
  3. 4. A what is an extremely large sphere oh hot gas that gives out light?
  4. 5. Which is the biggest planet in our solar system?
  5. 7. What is the thing Earth have 23.5 degree called?
  6. 10. A what is a group of billions or stars?
  7. 11. An what is a small, rocky object that orbits the sun?
  8. 13. On which planet do human beings live?
  9. 15. What is the only one star in our solar system?