Thanks shu to always keep me first in following .What is a supernova and what causes it?.How long does supernova last?.

Thanks shu to always keep me first in following .What is a supernova

1.	Thanks shu to always keep me first in following .What is a supernova and what causes it?.How long does supernova last?.
Answer» se Valt, you are my best Tomodachi in Brainly. A supernova is a powerful and luminous STELLAR explosion. This transient astronomical event OCCURS during the last evolutionary stages of a massive star or when a white dwarf is triggered into runaway NUCLEAR fusion. A supernova happens where there is a change in the core, or center, of a star. ... One of the stars, a carbon-oxygen white dwarf, steals matter from its companion star. EVENTUALLY, the white dwarf accumulates too MUCH matter. Having too much matter causes the star to explode, resulting in a supernova.The explosion of a supernova occurs in a star in a very short timespan of about 100 seconds. When a star undergoes a supernova explosion, it dies leaving behind a remnant: either a neutron star or a black hole.