Across
- 5. Named after the Roman God of the underworld.
- 7. Was named after Jupiter's father.
- 9. It's a big blue mystery.
Down
- 1. Has a giant "eye".
- 2. 24 hour rotation period
- 3. Smallest planet
- 4. Galileo Galilei observed it with a telescope first.
- 6. May be an exploded planet.
- 8. Has canyons, dunes, and ice.