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