Voyager II is the only probe to have ever visited this planet and during that mission it photographed its moon Triton.
James Challis used the work of John Couch Adams to search for this object. In 1949, Gerad Kuiper discovered what appears to be a captured asteroid orbiting this body. One of its notable satellites was discovered by William Lassell. It was Heinrich d'Arrest and Johann Galle that first spotted this object, but credit for its discovery is usually given to Le Verrier. Voyager II is the only probe to have ever visited this planet and during that mission it photographed its moon Triton. For 10 points, name this eighth planet.
James Challis used the work of John Couch Adams to search for this object.
{Neptune}