You will be given a definition of a task first, then some input of the task.
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.

According to the Nemesis hypothesis most of its contents would be swept out. The two most accepted models of its origin, the Safronov and Cameron ones, were both offered in the 1970s well after its proposal in 1950. Its hypothesis was based on two observations: first, the inclinations of LPC's show a random distribution, and second, a histogram plot of the aphelia [APP-heel-ya] of observed LPC's shows peaks at 10,000 AU and 50,000 AU. FTP, name this area in the outer reaches of the solar system that is the source of long period comets as hypothesized by its namesake Dutch astronomer.
Output:
Science