Across
- 4. a person who goes into space
- 6. The ending of a story.
- 9. Flowing water.
- 10. In science fiction, to change a planet to resemble Earth.
- 12. A natural satellite of a planet.
- 15. What is it called when someone talks when you are talking?
- 17. the result of an asteroid hitting a planet or moon.
Down
- 1. top and bottom of a planet.
- 2. Taking control of a place using military force.
- 3. gasses around planets
- 5. A person who investigates space,planets, and asteroids.
- 7. system planets orbiting a sun
- 8. soil that is frozen all the time
- 11. Small pieces of rock that come into Earth's atmosphere.
- 13. curved path
- 14. The shape of a ball.
- 15. Unwelcome intrusion into another's domain.
- 16. Something that needs immediate action is what?