Across
- 3. central region
- 5. is the largest planet
- 7. a region of the solar system between mars and jupiter
- 8. an object that orbits the sun
- 9. areas where it is cooler on the sun
- 10. is the smallest planet
- 13. a solid inner core
Down
- 1. are the four outer planets
- 2. streches out 1,000 time the distance between the sun and neptune
- 3. loose collections of ice
- 4. extends 100 times earth's distance from the sun
- 6. when rock and ice form small bodies
- 11. is a thin disc of particles
- 12. a shooting star
- 14. clouds of gad and dust form a fuzzy outer layer