World to explore

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Across
  1. 2. a collection of star systems
  2. 6. pass through
  3. 10. connected with or engaged in the exchange of goods
  4. 11. space: any location outside the Earth's atmosphere
  5. 13. a craft capable of traveling in outer space
  6. 14. any celestial body orbiting around a planet or star
Down
  1. 1. not fit for habitation
  2. 3. of or relating to or associated with the moon
  3. 4. incapable of being avoided or prevented
  4. 5. of or relating to or caused by a poison
  5. 7. someone who travels to unknown regions to make discoveries
  6. 8. a person trained to travel in a spacecraft
  7. 9. very unlikely to be true, and difficult to believe
  8. 12. lengthen or extend in duration or space