Crossword of Moons

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Across
  1. 2. The whitest object in the solar system.
  2. 5. The moon that orbits in the opposite direction.
  3. 6. Largest moon in the solar system.
Down
  1. 1. The only moon that has liquid bodies on its surface.
  2. 3. Largest moon of Pluto.
  3. 4. The darkest moon of Uranus.