SPACE

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