Across
- 2. The percent of the mass the sun takes up in the solar system.
- 4. pieces of rock floating in space.
- 7. How much hours it takes for earth to rotate on its axis.
- 9. The sun is an average size ____.
- 11. The amount of days it takes earth to orbit around the sun.
- 12. The earth is the only known planet with life.
Down
- 1. The earth has seven of them.
- 3. The center of the earth.
- 5. Dark spots on the sun.
- 6. 1/4 as big as the earth.
- 8. _______ covers the Moon and where caused by asteroids
- 10. _______ holds us on earth.