Across
- 1. This is the second closest planet to the sun.
- 5. This planet is 17 times the mass of earth!
- 7. This is the name of the part of space that includes the sun and the objects orbiting it.
- 9. This planet is now considered a dwarf planet.
- 11. This planet has the coldest planetary atmosphere.
- 12. This is the largest planet in our solar system.
Down
- 2. This is the second to biggest planet.
- 3. A scientific instrument used to see deep into space.
- 4. A rover named Curiosity is on this planet right now.
- 6. This is the smallest planet.
- 8. A giant ball of Plasma.
- 10. This is the only planet we know of that can hold oxygen in it's atmosphere.