Astronomy

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Across
  1. 3. dim small star
  2. 4. small rock body
  3. 5. system of stars, gas and dust
  4. 6. force of attraction
  5. 9. bowl shaped hole
  6. 10. block the sun or moon
  7. 13. study of celestial objects
  8. 14. frozen leftover of solar system
  9. 15. radioactive ray
  10. 16. star pattern
  11. 18. ordered universe
  12. 19. start of universe
Down
  1. 1. another word for outer space
  2. 2. small planet
  3. 3. 85% of universe
  4. 7. first quarter moon
  5. 8. intense gravity region
  6. 11. Russian astronaut
  7. 12. fully illuminated moon
  8. 16. layer of sun
  9. 17. black hole boundary