Astronomy

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Across
  1. 6. is the study of the universe
  2. 7. we can see it at night
  3. 11. the guy that made the telescope
  4. 12. the line where the sea meets the sky
  5. 13. the 7th planet from the sun
  6. 15. this star gives us light
  7. 16. has the same name as a chocolate bar
  8. 17. the world we live on
  9. 18. the dwarf planet
  10. 20. the thing in which people go to space
  11. 21. when the earth is in the middle
Down
  1. 1. the liquid inside the thermometer
  2. 2. this planet has rings
  3. 3. where the sun is in the middle of the universe
  4. 4. ___ hole
  5. 5. the red planet
  6. 8. the thing that helps us breath
  7. 9. the largest planet in the solar system
  8. 10. to send or shoot a rocket into space
  9. 14. a layer of gas that envelopes a planet
  10. 19. a snowball of frozen gases