Task: Text Categorization
Input (English): 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.
Output (English): Science