Across
- 3. invisible line that Earth spins around
- 8. the complete trip an object makes around another object
- 10. to bounce light off a surface.
- 11. Earth spins on an imaginary line called an axis
- 13. Earth's natural satellite
Down
- 1. the only planet in our solar system known to support life
- 2. how much light shines on a surface
- 4. the center of our solar system
- 5. the four periods of the year
- 6. giant ball of hot gas in space
- 7. cycle the changing amount of the Moon we see from Earth each month
- 9. the curved path an object takes as it travels around another object
- 12. phase the part of the Moon that looks lit by the Sun