Across
- 4. A bowl-shaped depression or hollowed-out area
- 6. No longer considered a planet
- 8. A mixture of gases that surround the earth
- 9. A big ball of fire
- 10. Scientists have sent space rovers here
- 11. The study of everything in the universe
- 14. Earth is this type of planet
- 16. The coldest planet on our solar system
- 17. The biggest planet in our solar system
Down
- 1. The planet farthest away from the sun
- 2. A huge collection of gas, dust and stars
- 3. The hottest planet in our solar system
- 4. cosmic snowballs of gases dust and rock
- 5. The smallest particle of a substance
- 7. The planet famous for its rings
- 10. An object that orbits another planet
- 12. A space rock that is crashing through earth's atmosphere
- 13. The closest planet to the sun
- 15. The planet we live on
- 16. This includes everything including planets