Across
- 5. an imaginary line halfway between the North and South Poles
- 7. a half of the Earth, either north or south of the Equator
- 9. a large natural object that orbits a planet
- 10. a representation of an idea, object or system
- 12. a large space rock that orbits the Sun
- 14. a group of millions or billions of stars
- 15. the regular rise and fall of the sea
Down
- 1. the phase when the sunlit side of the Moon is facing towards Earth
- 2. any object that orbits a planet or star
- 3. a time of year with typical weather patterns and daylight hours
- 4. a planet that is made up of mostly icy materials
- 6. the time it takes a planet to orbit once around the sun
- 8. the galaxy in which the Solar System is located
- 11. the motion of one object around another because of gravity
- 13. the time it takes for a planet to rotate once