Some other mechanism is of outbreaks of type supernovae (SN Ia). This so-called thermonuclear supernova, the core mechanism of the explosion which is the process of nuclear fusion in a dense carbon-oxygen core of the star. Precursors of SN Ia are white dwarfs with a mass close to the limit. It is generally accepted that such stars can be formed when peretekanii the substance of the second component of double star system. This happens when the second star of the system goes beyond its Roche cavity or related to a class of stars with extremely stellar wind. When increasing the mass of the white dwarf increases its density and temperature. Finally, when the temperature of the order of 3 - 108 K, there are conditions for the thermonuclear podzhiganiya carbon-oxygen mixture. From the center to the outer layers of combustion front starts to spread, leaving behind the products of combustion - Kernel group of iron. Distribution of the front of combustion occurs in a slow deflagratsionnom mode is unsustainable and to various kinds of disturbances. The greatest importance is the Rayleigh-Taylor instability, which arises from the action of Archimedean forces on light and less dense products of combustion, as compared to the dense carbon-oxygen shell. Begin intensive, large-scale convective processes, leading to further enhance the fusion reaction and to provide necessary relief shell supernova energy (~ 1051 erg). The speed of the combustion front increases, it is possible turbulizatsiya flame and shock wave formation in the external layers of the star.