extraterrestrial planets

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Across
  1. 3. the gas giant have these but the terrestrial planets don't
  2. 4. these planet arn't solid they're
  3. 5. Saturn has 9 of these but you can find them on all of the gas giants
  4. 6. this is a common element when talking about the gas giants
Down
  1. 1. if they'er not terrestrial they'er
  2. 2. this is the inter-most part of a planet and are rumored to be liquid in the gas giants