Across
- 1. Gas giants don't have a ______ surface.
- 6. In 1610 ________ were discovered around Saturn.
- 9. There used to be a 9th planet called ______.
- 10. The Moon is Earth's natural _________.
- 12. Rings are made of rock, ice, and _______.
- 13. Stars are huge, glowing balls of _____.
Down
- 1. Mercury is the closest planet to the _____.
- 2. The Earth _______ the Sun.
- 3. About 70% of the Earth's surface is _______.
- 4. The largest planet in our solar system
- 5. Jupiter may have as many as 79 ________.
- 7. The Sun is actually a ______.
- 8. Gases on Uranus make it appear _______.
- 11. Water exists on Mars in the form of _____.