The Void that is Space

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Across
  1. 3. A fiery sphere of flaming gasses
  2. 4. Greek god of the sun; name of a space program
  3. 5. Where we live
  4. 7. The sixth planet from the sun
  5. 10. A planet we plan to colonize; or at least visit
  6. 11. A large completely empty space; like space!
  7. 12. The space agency that goes with the government
  8. 14. The seventh planet from the sun
  9. 15. Our means of flying to space
Down
  1. 1. A popular space film series with droids
  2. 2. Now a dwarf planet
  3. 6. The people who go to space
  4. 8. Greek god of the moon; name of future program
  5. 9. The fifth planet from the sun
  6. 10. A sphere that orbits around us
  7. 13. Final word in the title