Across
- 2. layers of gases surrounding a planet.
- 4. A theoretical type of exoplanet with an ice
- 8. The asteroids orbiting the Sun in a ring
- 9. Planets that revolve around the Sun.
Down
- 1. They're balls of hydrogen and helium
- 3. an invisible force that pulls items
- 5. The outside part of something
- 6. The arrangement of elements within space
- 7. Where all the planets and galaxies are.