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