Space

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Across
  1. 4. from the sun
  2. 5. fifth planet from the sun
  3. 7. natural/manmade object orbiting a planet
  4. 10. layers of gas
  5. 11. one who travels to space
  6. 12. 29.5 Earth years to orbit sun
  7. 14. go around
  8. 16. icy, dusty celestial object
  9. 18. bright lights at the poles of Earth
  10. 19. when light shines back
Down
  1. 1. crash
  2. 2. hottest planet in solar system
  3. 3. a celestial body orbiting sun
  4. 6. a space rock
  5. 8. only planet with known life
  6. 9. natural satellite around a planet
  7. 11. small pieces rock in solar system
  8. 13. a gas
  9. 15. in the middle
  10. 17. made from collisions