Across
- 2. main difference between our planets
- 5. planet
- 7. system of planets
- 10. suitable or good enough to live in
- 11. not in the ... future
- 12. (CO2)what we need to terraform mars
- 13. without it we would never be able to travel to space
Down
- 1. mars' nickname
- 3. process of planetary engineering
- 4. National Aeronautics and Space Administration
- 6. where the planets are
- 8. what we need to travel to space
- 9. our purpose
- 11. is the ..... planet from the Sun
- 14. our planet