Its diameter is about 1.39 million kilometers (864,000 miles), or 109 times that of Earth. It is by far the most important source of energy for life on Earth. It is a nearly perfect ball of hot plasma, heated to incandescence by nuclear fusion reactions in its core, radiating the energy mainly as visible light, ultraviolet light, and infrared radiation. The Sun is the star at the centre of the Solar System. ≈ 370 km/s (relative to the cosmic microwave background) ≈ 20 km/s (relative to average velocity of other stars in stellar neighborhood) ≈ 251 km/s (orbit around the center of the Milky Way)
Sun, Sol / ˈ s ɒ l/, Sól, Helios / ˈ h iː l i ə s/ False-color image taken in 2010 as seen in ultraviolet light (wavelength of 30.4 nm)
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