Across
- 5. coldest planet in the solar system
- 7. a large group of stars
- 9. first living organism sent into space
- 10. largest planet in the solar system
- 11. smallest moon in the solar system
- 12. a small body of matter that enters Earth's atmosphere
- 14. brightest star in constellation Ursa Minor
- 15. only inhabited planet in the solar system
Down
- 1. largest star known to man
- 2. 0.93% of Earth's atmosphere
- 3. a small rocky body orbiting the sun
- 4. National Aeronautics and Space Administration
- 6. Jupiter's largest moon
- 8. first artificial Earth satellite
- 13. number of planets in the solar system