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.
Q: Different forms of these objects are noted by their lack of a silicon absorption line at 615 nanometers. They are believed to occur from the rapid and violent collapse of a tightly bound iron core and in their aftermath they can compress to form an extremely dense (*) neutron star. The Type Ia form of these objects typically occurs when a white dwarf exceeds the Chandrasekhar limit. The Crab Nebula is the result of one of these objects observed by Chinese astronomer in 1054 CE. For 10 points, name these stellar explosions.
A:
Science