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.

Example input: In one work this author details the life of a tomb-maker who makes extra money by playing the organ at an insane asylum, while another of his novels sees Swartz give a refugee proper documentation only after he tells him his life story in the title Portuguese city. In addition to The Black Obelisk and The Night in Lisbon, he also wrote about Robert and Otto selling their auto workshop and visiting Patrice in a Swiss tuberculosis sanatorium in his novel The Three Comrades, while the turbulent life of the German surgeon Ravic is told in The Arch of Triumph. Another of his novels, The Road Back, is thought to be a sequel to his most famous book, in which the patriotic teacher Kantorek convinces Paul Bumer and his friends to join the Germany Army during World War I. For 10 points, name this German author who wrote All Quiet on the Western Front.
Example output: Literature
Example explanation: The text is talking about an author and their works, so it belongs to theliterature category.
Q: The Palomar-Green survey catalogued several of these objects, and the Soltan argument posits the existence of "dead" ones of these if they are powered in a certain way. X-ray binaries are sometimes referred to as "micro-" ones, and another type of these objects are similar to BL Lac objects and can change output by up to 50% in a day, referred to as optically violent variable ones. Neutral hydrogen in the interstellar medium leads to a suppression of emissions from these objects on one side of the Lyman-alpha line, known as the Gunn-Peterson trough. A double one of these dubbed "Old Faithful" was the first gravitationally lensed object observed, and another is known as Einstein's Cross. FTP, name these stellar objects, which are distant galaxies with a supermassive black hole at their center, whose name originally meant "quasi-stellar radio source".
A:
Science