Across
- 2. Pluto, for example
- 5. the Milky Way is ours
- 7. like Saturn, this planet is made up mostly of gas
- 8. Edward Halley has one named after him
- 10. Earth's natural satellite
- 11. on Earth, 365 revolutions around the sun
- 12. the third planet from the sun
Down
- 1. a star and all the objects that orbit it
- 3. one rotation around Earth's axis
- 4. planet known for its rings
- 6. the planet closest to the sun
- 9. this makes up most of Uranus and Neptune
- 10. NASA is exploring this planet now