SUPERNOVA
What is Supernova??
Supernova is a stellar explosion that is more energetic than a nova, Supernovae are extremely luminous and cause a burst of radiation that often briefly outshines an entire galaxy, before fading from view over several weeks or months.
Why it’s happened?
It’s happen when the star was expired because of it’s age make the number of mass higher until it pass the limit of itself.
Basic types of supernovae
Type I Supernovae
It starts with a pair of stars, one will enlarge becoming more massive which will spill the gas to the smaller star, the lighter star and the core of the giant star spiral toward a common envelope which is ejected. They become closer to each other and the core of the giant star becomes a white dwarf. The smaller star will spill gas onto the white dwarf causin its mass to increase until it explodes and the smaller star is ejected.
Type II Supernovae
Stars with at least nine solar masses of material evolve in a complex fashion. In the core of the star, hydrogen is fused into helium and the thermal energy released creates an outward pressure, which maintains the core in hydrostatic equilibrium and prevents collapse
When the core's supply of hydrogen is exhausted, this outward pressure is no longer created. The core begins to collapse, causing a rise in temperature and pressure which becomes great enough to ignite the helium and start a helium-to-carbon fusion cycle, creating sufficient outward pressure to halt the collapse. The core expands and cools slightly, with a hydrogen-fusion outer layer, and a hotter, higher pressure, helium-fusion center.
