Solar System

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