Space Puzzle

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Across
  1. 2. 7th planet from the sun.
  2. 3. 5th planet from the sun.
  3. 7. A chunk of rock in the Earth's atmosphere, usually burning up.
  4. 8. This has water and land and is the 3rd planet from the sun.
  5. 12. Unidentified objects flying in the sky.
  6. 14. Powerful engines that get you to space.
  7. 15. 8th planet from the sun.
  8. 16. Humans that go to space.
  9. 19. This protects a part of the spaceship so that the astronauts don't get burned up when coming back to earth.
  10. 20. 2nd planet from the sun.
Down
  1. 1. A path that a planet follows around the sun.
  2. 4. Used to be the 9th planet from the sun.
  3. 5. The hole a meteorite makes.
  4. 6. 6th planet from the sun.
  5. 7. 4th planet from the sun.
  6. 9. 1st planet from the sun.
  7. 10. When a star gets really big and explodes.
  8. 11. When a meteor hits the ground.
  9. 13. A big chunk of rock in space.
  10. 17. Big ball of burning gas.
  11. 18. At night it shines and it goes through a phase every 28 days.