by t henze
info on sun
of the Sun extends from the center to about 20–25% of the solar radius. It has a density of up to 150 g/cm3 (about 150 times the density of water) and a temperature of close to 15.7 million (K) By contrast, the Sun's surface temperature is approximately 5,800 K. Recent analysis of mission data favors a faster rotation rate in the core than in the rest of the radiative zone.Through most of the Sun's life, energy is produced by in the core region through a series of steps called the this process converts into Only 0.8% of the energy generated in the Sun comes from the though this proportion is expected to increase as the Sun gets older.
The core is the only region in the Sun that produces an appreciable amount of through fusion; 99% of the power is generated within 24% of the Sun's radius, and by 30% of the radius, fusion has stopped nearly entirely. The rest of the Sun is heated by this energy that is transferred outwards through many successive layers to the solar photosphere before it escapes into space as sunlight or the of particles.
The occurs around 9.2×1037 times each second in the core, converting about 3.7×1038 protons into (helium nuclei) every second (out of a total of ~8.9×1056 free protons in the Sun), or about 6.2×1011 kg/s.[ Fusing four free (hydrogen nuclei) into a single (helium nuclei) releases around 0.7% of the fused mass as energy,so the Sun releases energy at the mass–energy conversion rate of 4.26 million metric tons per second, for 384.6 watts (3.846×1026 W), or 9.192×1010 of per second. Theoretical models of the Sun's interior indicate a power density of approximately 276.5 W/m3, a value that more nearly approximates reptile metabolism than a thermonuclear bomb. Peak power production in the Sun has been compared to the volumetric heat generated in an active The tremendous power output of the Sun is not due to its high power per volume, but instead due to its large size.
The fusion rate in the core is in a self-correcting equilibrium: a slightly higher rate of fusion would cause the core to heat up more and slightly against the weight of the outer layers, reducing the fusion rate and correcting the ; and a slightly lower rate would cause the core to cool and shrink slightly, increasing the fusion rate and again reverting it to its present level.