Across
- 6. the 2nd planet to the sun
- 7. made of gas, dust, and ice and moves around the sun in an oval shape
- 8. this is what the outer planets are known as
- 10. When a planet's atmosphere traps in solar energy
- 11. the four largest moons around Jupiter
- 12. known for its ring system
- 13. the average distance from the Earth to the Sun
- 15. a meteoroid that that strikes a planet or moon
- 17. the four planets closest to the sun
- 18. the largest planet in the solar system
Down
- 1. orbits the sun in the asteroid belt
- 2. the time it takes an object to complete one rotation
- 3. a round depression formed on the surface of a planet, moon, or space object
- 4. the time it takes an object to travel once around the sun
- 5. small rocky particle that moves through space
- 9. closest planet to the sun
- 14. a meteoroid that has entered the Earth's atmosphere
- 16. the 4th planet from the sun