About Sun
The Sun is the star at the centre of the Solar System. It is a massive, nearly perfect sphere of hot plasma, heated to incandescence by nuclear fusion reactions in its core, radiating the energy from its surface mainly as visible light and infrared radiation with 10% at ultraviolet energies. It is the main source of energy for life on Earth. The Sun has.
The English word sun developed fromsunne. Cognates appear in other , includingsinne,zon,Sünn,Sonne,Sunna, sunna, and
CoreThe core of the Sun extends from the centre to about 20–25% of the solar radius.It has a density of up to 150 g/cm(about 150 times the density of water) and a temperature of close to 15.7 million(K).By contrast, the Sun's surface.
The Sun has athat varies across its surface. Its polar field is 1–2(0.0001–0.0002 ), whereas the field is typically 3,000 gauss (0.3 T) in features on the Sun called sunspots and 10–100 gauss (0.001–0.01 T) in .The magnetic field varies in.
The Sun has eight known planets orbiting it. This includes four(, , , and ), two( and ), and two( and ). The Solar System also has nine bodies generally considered asand.
The Sun is athat makes up about 99.86% of the mass of the Solar System.The Sun is classed as a G2 star,meaning it is a , with 2 indicating itsis in the second range of the G class. It has anof.
The Sun emits light across the . The energy of this sunlight supports almost all lifeon Earth by ,and drivesand weather.Its colour is , with acolour-space index near (0.3, 0.3), when viewed from space or when.
The Sun today is roughly halfway through the main-sequence portion of its life. It has not changed dramatically in over four billionyears and will remain fairly stable for about five billion more. However, after hydrogen fusion in its core has stopped, the Sun will undergo dramatic changes.
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