Sun

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The Sun is the star at the centre of the Solar System. It is a nearly perfect ball of hot plasma, heated to incandescence by nuclear fusion reactions in its core. The Sun radiates this energy mainly as light, ultraviolet, and infrared radiation, but also as heat and solar radiation, and is the most important source of energy for life on Earth.
== Core ==
The core 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 [Identical?] and a temperature of close to 15.7 million Kelvin (K). By contrast, the Sun's surface (photospheric) temperature is approximately 5800 K. Recent analysis of SOHO[dubious?] mission data favors a faster rotation rate in the core than in the radiative zone above. 
==Stages of Fusion==
Through most of the Sun's life, energy has been produced by nuclear fusion in the core region through the proton–proton chain; this process converts hydrogen into helium. Currently, only 0.8% of the energy generated in the Sun comes from another sequence of fusion reactions called the CNO cycle[Undefined?], though this proportion is expected to increase as the Sun becomes older and more luminous.
==Mantle==
The Sun's Mantle has a density of 150 g/cm3 [Identical?]at the center, and a temperature of 15 million kelvin (15 million degrees Celsius, 27 million degrees Fahrenheit).
==System Size Comparison ==
Size Comparison
Planet/Star	Size
Sun 	700,000 kilometers
Jupiter 	61.42 billion km
Saturn 	42.7 billion km
Uranus 	8.083 billion km
Neptune 	7.618 billion km
Earth 	510.1 million km
Venus 	460.2 million km
Mars 	144.4 million km
Mercury 	74.8 million km
Category:Content
Category:Stars
Category:Solar System
Category:Objects Visited by Spacecraft
Category:Objects with Atmospheres
Category:Objects In Hydrostatic Equilibrium