Across
- 2. water covering three-quarters of its surface and its one moon
- 5. gas giant
- 6. no longer a major planet
- 8. named for the swift message of the gods
- 9. our solar system sits inside one of the spiral arms of the _____ _____
- 12. Within our solar system are _______ major planets grouped by proximity to the sun
- 15. means to rotate backwards
- 17. known for having the largest ring system
- 18. called the red planet, due to iron oxide (rust) in the soil
- 19. has 63 moons and counting
Down
- 1. rocky objects that orbit the sun
- 3. large space rocks between Mars and Jupiter
- 4. Roman god of the sea
- 7. accurate view of space from Earth
- 8. about 180 discovered ____ orbit the planets of our solar system
- 10. small mass of dust and ice that originates in an area beyond Pluto called the Oort Cloud
- 11. remain stationary
- 13. survives its passage through the atmosphere and strikes Earth's surface
- 14. covered in a thick atmosphere of carbon dioxide
- 16. diameter is more than 100 times greater than Earth's