Detailed Instructions: 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.
Problem:A particular type of these that loses angular momentum very quickly is exemplified by SGR-1806-20, which had a major event on Dec. 27, 2004. The cores of these are not well understood, but may consist of differentially rotating strange fluid, explaining their equatorial bulges. Proposed by Baade and Zwicky, these include magnetars and have an upper mass limit named for Tolman, Volkov, and Oppenheimer because they are held together by degeneracy pressure from their namesake particles. FTP, name these stars, usually the remnants of supernovas, that are named for the fact that they are mostly comprised of uncharged nucleons.
Solution:
Science