Across
- 4. The time it takes a planet to orbit once around the Sun
- 7. Any phase when less than half of the sunlit side of the Moon can be seen
- 9. An imaginary line through an object around which it spins
- 10. A model of the Solar System in which Earth is at the centre
- 12. When the Sun is blocked from view by the Moon
- 14. A large natural object that orbits a planet.
- 15. An event where one object in space blocks another from view
- 16. an artificial body placed in orbit round the earth or moon or another planet in order to collect information or for communication
- 17. A group of millions or billions of stars.
Down
- 1. the force the holds us to the earth
- 2. the objects that orbit the sun
- 3. Any phase when the sunlit side of the Moon appears to shrink over time
- 5. The motion of one object around another because of gravity
- 6. A half of the Earth, either north or south of the Equator
- 8. the thing that defines night and day
- 11. The time it takes a planet to rotate once
- 13. A representation of an idea, object or system