Sol

Sol is the Roman equivalent of the ancient Greek sun god Helios. The Latin word sol means "sun"; the English word sun is descended from Old English sunne, which may be related. The English words solar, solaris, and solar system are derived from sol. In Hebrew, Sol is translated as שמש (pronounced shamesh). In Spanish, the word sol retains its original meaning of "sun". In modern astrophysics and astronomy, Sol is the Latin name for the star that is the Sun of the Solar System. It is a perfect sphere of hot plasma, heated to incandescence by nuclear fusion reactions in its core, radiating the energy mainly as light, ultraviolet, and infrared radiation. The Sun's diameter is about 1.39 million kilometers (864,000 miles), or 109 times that of Earth, and its mass is about 330,000 times that of Earth, accounting for about 99.86% of the total mass of the Solar System.