Q: In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.
In 2012, a circular feature was discovered on this body and nicknamed a "Hot Cross Bun" by NASA for the similarity of its cracks to those formed by uplift from baking. One feature on this body is a reflective region known as Xanadu, while Ganesa Macula and Sotra Facula may be sites of (*) cryovolcanism. The reflection of extremely low frequency radio waves from it may be an indication of an interior sea. This moon is home to Ontario Lacas, discovered to be a hydrocarbon lake by the Cassini-Huygens mission. An indicator of life on this body is the presence of higher concentrations of hydrogen in this body's upper atmosphere than in its lower atmosphere. For 10 points, name this only satellite with a dense atmosphere, the largest moon of Saturn.
A:
Science