CROSSTELLATION

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Across
  1. 3. The study of everything in the universe
  2. 7. An observatory
  3. 11. Can be bright and can be dim
  4. 12. Between the inner and outer planets
  5. 14. Not visible to the naked eye
  6. 16. Small icy dirt balls
  7. 17. Our solar system belongs to
  8. 18. Form at the end of some stars' lives
  9. 19. To move around a line
Down
  1. 1. Ninth largest celestial body
  2. 2. Natural satellite
  3. 3. Profession
  4. 4. Dwarf planet
  5. 5. The force
  6. 6. Agroup of visible star
  7. 8. Above us
  8. 9. A strange creature
  9. 10. To magnify the image of celestial body
  10. 13. A ring planet
  11. 15. Astronomical event - temporarily