Across
- 4. containers of compressed nitrogen gas
- 6. enough mass to hold the planets in orbit
- 8. eight planets and their moons orbit around the sun (two words)
- 10. liveable, things can live there
- 11. located between Mars and Jupiter
- 12. an object consisting of ice and dust
- 15. farther planets from the sun (two words)
- 16. largest planet in the solar system
- 17. many planets are orbited by this
- 18. closest planet to the sun
- 19. third planet from the sun
- 20. a body orbiting a big star
Down
- 1. a item wore to allow an astronaut to survive in space
- 2. force that pulls things down
- 3. closer plants from the sun (two words)
- 5. rocky object moving in space between planets
- 7. sun centered
- 9. a small rocky body orbiting the sun
- 13. a vehicle used for traveling in space
- 14. a small body of matter that enters the earth's atmosphere