Across
- 1. a group of planets the in the outer orbit of the solar system
- 4. a ring like direction which around the sun
- 7. solar energy
- 8. the planet that the human are living in
- 9. a period of time that the earth is travelled one round of the sun
Down
- 1. the period if the planet the travelled one round of the sun
- 2. the second layer of the earth
- 3. the force between the matter and the planet
- 5. system the group of planets
- 6. a period of time that have on light in one hemisphere of the the earth