Across
- 4. solid piece of debris that survives impact with the earth
- 5. surname of the first person on the moon
- 6. our galaxy is called the ?
- 10. a person who travels into space
- 11. Uranus can not be seen without a ?
- 14. the sun is a very large ?
- 15. a stellar explosion of stars
- 17. asteroids are mostly made of air and ?
- 18. the only celestial body humans have set foot on other than earth
- 19. known as the red planet
Down
- 1. how many planets are there? (do not count pluto).
- 2. a dwarf planet
- 3. groups of stars that form patterns in the night sky
- 7. the largest planet
- 8. the moon is covered in ?
- 9. each star in the sky is a glowing ball of ?
- 12. astronauts travel by ?
- 13. the planet humans live
- 14. Mercury is the closest planet to the ?
- 16. Saturn is surrounded by ?