Across
- 4. The force that keeps planets in orbit.
- 6. The line that divides the earth into two halves.
- 9. The angle of the axis, responsible for seasons.
- 10. The line where the earth and the sky meets.
- 12. The name of half a sphere.
- 13. Shadows become like this from sunrise to midday.
Down
- 1. The Moon is this type of satellite.
- 2. Celestial bodies that make their own light.
- 3. Man made machines that move around the earth.
- 5. The time it takes the earth to orbit the sun.
- 7. Our solar system has eight of them.
- 8. The line that the earth spins on.
- 11. The way the earth moves around the sun.