It's largest moon sports both cantaloupe terrain and active nitrogen geysers and orbits in a retrograde orbit; that moon is Triton.  
This planet's outermost ring, Adams, appears twisted, either from a smeared camera or interaction with a shepherd satellite, and another satellite was only found when it eclipsed a star and was subsequently lost until a visit by Voyager II.  In addition to Galatea and Larissa, this planet's atmosphere contains D2 and a (*) "scooter" which completes a revolution every sixteen hours.  It's largest moon sports both cantaloupe terrain and active nitrogen geysers and orbits in a retrograde orbit; that moon is Triton.  For 10 points, methane colors the Great Dark Spot blue of what eighth planet from the sun?_
This planet's outermost ring, Adams, appears twisted, either from a smeared camera or interaction with a shepherd satellite, and another satellite was only found when it eclipsed a star and was subsequently lost until a visit by Voyager II.  
{Neptune} _