Across
- 3. the amount of matter something is made of
- 6. the way astronauts get into space
- 7. the planet we live on
- 8. a large dent in the ground
- 10. our only star in our galaxy
- 12. a group of stars in the sky
- 13. an icy rock that lets off gas and dust
- 15. a being having no proof of being out there
- 16. the building block of matter
Down
- 1. the gas held by gravity around the earth
- 2. The force that keeps everything on the ground
- 4. a very large ball of hot matter held together by plasma
- 5. a place in space where matter and light cannot escape if they fall in
- 8. the universe seen as a whole
- 9. rocks floating in space
- 11. where we live
- 13. the outer atmosphere of a star
- 14. a ball of rocks and gas that is in space