Across
- 5. They study the universe.
- 8. Fire balls.
- 9. 4th planet
- 11. Rocky objects that orbit the sun.
- 12. The first planet to be discovered.
- 14. Something we live on.
- 15. A invisible line through earth.
Down
- 1. Biggest planet.
- 2. A way of transport to space.
- 3. No longer a planet.
- 4. It orbits Earth.
- 5. Someone who fly's into space.
- 6. A group of thing related that work together as a whole.
- 7. Earths Twin.
- 10. Something we live in.
- 13. Hottest planet.
