Task: Text Categorization
Input (English): The Tano Sulcus bisects part of this bodys surface. Its motion is technically anti-synchronous with respect to the object it orbets. Found by William Lassell, its so-called cantaloupe terrain is probably caused by cryovulcanism and its atmosphere consists largely of hydrocarbons, including methane. For ten points, name this largest moon in the solar system with a retrograde orbit, the most massive moon of Neptune.
Output (English): Science