text: The Roche Limit describes the distance at which these structures will form from surrounding particulates.
full_question: The Roche Limit describes the distance at which these structures will form from surrounding particulates. Thirteen of these structures have been identified since 1977 in association with Uranus. Rhea was the first moon in our solar system speculated to have these structures, although other imaging suggested magnetism interfered with imaging. (*) Tidal deceleration leads scientists to believe that Phobos will break up in the next fifty million years and become Mars’ first one of these structures. For 10 points, name these disc-shaped structures that are most prominently located around Saturn.
first_sentence: The Roche Limit describes the distance at which these structures will form from surrounding particulates.