Space Conquest

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Across
  1. 4. - Space explorer from Earth.
  2. 6. Refers to the Sun.
  3. 8. Pertaining to the Moon.
  4. 10. The final frontier.
  5. 12. Another term for the universe.
  6. 14. Early astronomer and space observer.
  7. 16. NASA probe reaching interstellar space.
  8. 17. Small rocky body in space.
  9. 18. When one celestial body blocks another.
  10. 19. Extraterrestrial life.
  11. 22. - NASA's moon-landing missions.
  12. 23. Path of an object around another.
  13. 24. Massive system of stars.
Down
  1. 1. - Robotic vehicle exploring Mars.
  2. 2. Force that pulls objects together.
  3. 3. Planet with iconic rings.
  4. 5. Region with intense gravity.
  5. 7. Planet targeted for future missions.
  6. 9. All of space and everything in it.
  7. 10. - First artificial satellite.
  8. 11. Space ____, orbiting lab.
  9. 12. Celestial object with a glowing tail.
  10. 13. Reusable spacecraft program.
  11. 15. Smallest planet in the Solar System.
  12. 20. US space agency.
  13. 21. - Earth's natural satellite.