Space exploration

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Across
  1. 2. adjective,without any crew of human
  2. 4. someone who travels to unknown regions to make discoveries
  3. 5. a small celestial body composed of rock and metal
  4. 7. the path of a celestial body in its revolution around another
  5. 8. of or relating to or associated to the moon
  6. 11. the property of having no weight in space
  7. 14. a nickname of our galaxy refering to the light emitted by its faint stars
  8. 15. a person trained to travel in a spacecraft
  9. 17. a celestial body that revolves around the sun
  10. 18. the largest planet of the solar system
  11. 19. a craft capable of travelling into outer space
  12. 20. propel with force
  13. 24. a jet engine containing its own propellant and driven by reaction propulsion
  14. 25. the natural satellite of the Earth
  15. 27. any celestial body orbiting around a planet or star
Down
  1. 1. a heavenly body with such strong gravity that light cannot escape it
  2. 3. a mass that enters earth's atmosphere becoming incandescent
  3. 6. american space agency
  4. 9. adjective,not fit for habitation
  5. 10. the envelope of gases surrounding any celestial body
  6. 12. the force of attraction between all masses in the universe
  7. 13. a manned artificial satellite in a fixed orbit for scientific research
  8. 16. the activity of sending humans to space for fun
  9. 21. the universe considered as a whole
  10. 22. a unit of length in astronomy equal to the distance that light travels in one year
  11. 23. settle as a colony
  12. 26. a collection of star systems