Across
- 2. Mountains that erupt molten rock
- 4. Uranus' axis is tilted on its side
- 6. Jupiter's largest moons discovered first
- 7. Objects that orbit planets
- 9. Another name for planets and moons
- 10. The topography or surface features
Down
- 1. Tall peaked formations on planets
- 3. Gaseous layer around a planet
- 5. How compacted the matter inside is
- 8. The outer solid layer of a world