Across
- 2. celestial body of hot gases.
- 3. Galaxy that contains our solar system.
- 4. smallest planet
- 6. 2nd planet from the sun.
- 7. largest planet.
- 10. 4th planet from the sun.
- 12. rise and fall of level of water in the ocean.
- 14. 6th planet from the sun.
- 15. large reddish late in its life cycle.
Down
- 1. understanding of the nature of the universe.
- 5. pattern of stars in the sky.
- 8. all of space and everything in it.
- 9. small rocky body orbiting the sun.
- 11. meteoroid that has hit earths surface.
- 13. 3rd planet from the sun.