Look Up In the Sky

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Across
  1. 2. puffy sky sight
  2. 5. the milky way is one
  3. 7. earth warmer
  4. 10. wind-borne toy
  5. 11. jet
  6. 12. natural electric discharge
  7. 15. showery day arch
  8. 16. sunset location
  9. 17. earth orbiter
  10. 18. Sirius, for one
  11. 19. nocturnal mammal
  12. 20. It's a _____, it's a plane, it's superman
  13. 21. Halley's ______
Down
  1. 1. aurora borealis; northern _________
  2. 2. aries or orion
  3. 3. big or little constellation
  4. 4. ringed planet
  5. 6. rocky space object
  6. 8. goodyear floater
  7. 9. the red planet
  8. 11. venus or earth
  9. 13. aircraft that hovers
  10. 14. NASA projectile
  11. 20. dark spot in space