Across
- 2. large natural object that orbits, or travels around, Earth
- 5. the only planet that spins on its side.
- 6. basic building block for all matter in the universe.
- 8. it's getting gradually smaller.
- 10. place in space where gravity pulls so much that even light cannot get out.
- 11. how fast light can travel in one year
- 13. the hottest planet in our solar system.
- 14. one object in space, like a planet or moon, passes through the shadow of another object in space.
Down
- 1. an object that moves around a larger object.
- 3. substance that is in a gaseous, or vaporous, state of matter.
- 4. are the largest objects in the solar system after the Sun
- 7. consists of the Sun and everything that orbits, or travels around, the Sun.
- 9. invisible force that pulls objects toward each other.
- 12. vast, unknown cosmos is brought into order, the earth having its proper place in the center.