Solar system crossword

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Across
  1. 3. planet we live on
  2. 4. planet with rings
  3. 5. what twinkles at night
  4. 7. streak of light left by a meteoroid
  5. 8. name of a chocolate bar
  6. 10. biggest planet
  7. 13. study of the sky and outer space
  8. 15. how many planets in the solar system
  9. 16. the study of how the universe began
  10. 18. imaginery line through the centre of a planet
  11. 21. name of the first space ship that landed on the moon
  12. 22. planet closet to the sun
Down
  1. 1. hottest planet
  2. 2. planet with a faint ring
  3. 4. what an astronaut wears
  4. 6. name of the Roman sea god
  5. 9. what launches into space
  6. 11. the largest star we can see from earth
  7. 12. body orbiting a planet
  8. 14. our galaxy
  9. 17. what can we see as it reflects the suns light
  10. 19. farthest away planet
  11. 20. what has a bright tail in the night sky