SPACE

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Across
  1. 6. - A habitable artificial structure in space
  2. 8. - A rocky object that orbits the Sun
  3. 10. - The fourth planet from the Sun
  4. 12. - A vast system of stars, gas, and dust
  5. 13. - A person who travels and works in space
  6. 15. - A cloud of gas and dust in space
  7. 17. - Earth's natural satellite
  8. 18. - A celestial object composed of ice and dust
  9. 19. - A large celestial body that orbits a star
Down
  1. 1. - An object that orbits a planet or a star
  2. 2. - An explosive event in a star
  3. 3. - The largest planet in our solar system
  4. 4. - A celestial body that emits light
  5. 5. - A vast system of stars, gas, and dust
  6. 6. - The center of our solar system
  7. 7. - An instrument used to observe distant objects in space
  8. 9. - The planet known for its prominent ring system
  9. 11. - A person who travels and works in space
  10. 14. - A vehicle that propels itself into space
  11. 16. - Unidentified Flying Object