Planets

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Across
  1. 1. Spins backward and shrouded in clouds of sulfuric acid.
  2. 4. The gas giant sporting a Great Red Eye.
  3. 5. named after a god of the sea.
  4. 6. famous for robotic visitors.
Down
  1. 2. Known for its icy rings,
  2. 3. Rolls on its side and glows a chilly cyan.