Cowboy Space Race

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Across
  1. 1. Wild horse of the American West
  2. 3. Region nearly empty of matter, yet not truly “nothing”
  3. 6. Six-shooter favoured by cowboys
  4. 9. Title once given to Pluto before 2006
  5. 10. Town lawman, often wearing a star-shaped badge
  6. 13. Tilt of this Earth feature causes the seasons
  7. 14. Pistol showdown at high noon
  8. 15. Constellation known as “The Hunter”
  9. 16. Wide grassland home to bison and cattle
  10. 17. Yuri Gagarin was the first person to hold this title in 1961
  11. 18. Train or stagecoach robber
Down
  1. 2. Type of Western film made in Italy in the 1960s
  2. 4. Telescope that revealed the “deep field” of distant galaxies
  3. 5. Constellations through which the Sun appears to travel each year
  4. 7. Elon Musk’s rocket company
  5. 8. George Lucas’ saga set “a long time ago in a galaxy far, far away”
  6. 10. Source of heavy elements like gold and uranium in the universe
  7. 11. Deep rocky valley carved by rivers
  8. 12. Halley’s example of this is visible from Earth every 76 years
  9. 14. Mechanical helper in sci-fi universes