Definition: 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.
Input: An early theory of the origin of these involved the breakup of relativistic "beebees" while Meszaros and Rees proposed the relativistic fireball shock model to explain their non-thermal broken power law spectrum. Woosely and Paczynski proposed that they are explicable by the collapsar model for Wolf-Rayet stars, which form black holes that feed an electron-positron-baryon jet. First detected by Vela military satellites, their afterglow was first observed by the BeppoSAX satellite using an x-ray detector and data from NASA's Compton Observatory showed they originate from far outside the Milky Way. FTP, identify these astronomical phenomena classified either as long- or short-duration depending if they last over two seconds and named for their intense output of high-energy photons.
Output:
Science