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The Sun is the star at the center of the Solar System. It is a nearly perfect sphere of hot plasma, heated to incandescence by nuclear fusion reactions in its core, radiating the energy mainly as light and infrared radiation. It is by far the most important source of energy for life on Earth. Its diameter is about 1.39 million kilometres (864,000 miles), or 109 times that of Earth, and its mass is about 330,000 times that of Earth. It accounts for about 99.86% of the total mass of the Solar System.
Roughly three quarters of the Sun's mass consists of hydrogen (~73%); the rest is mostly helium (~25%), with much smaller quantities of heavier elements, including oxygen, carbon, neon, and iron.The Sun is a G-type main-sequence star (G2V) based on its spectral class. As such, it is informally and not completely accurately referred to as a yellow dwarf (its light is closer to white than yellow). It formed approximately 4.6 billion years ago from the gravitational collapse of matter within a region of a large molecular cloud. Most of this matter gathered in the center, whereas the rest flattened into an orbiting disk that became the Solar System. The central mass became so hot and dense that it eventually initiated nuclear fusion in its core. It is thought that almost all stars form by this process.
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Taunton is a town in Somerset, England, with a 2011 population of 69,570. It has over 1,000 years of religious and military history, including a 10th-century monastery. Taunton Castle has origins in the Anglo Saxon period. It was later the site of a priory. The Normans then built a stone castle that belonged to the Bishops of Winchester. Today's reconstructed buildings are the inner ward, housing the Museum of Somerset and Somerset Military Museum. Events include the Second Cornish uprising of 1497, when Perkin Warbeck marched a 6000-strong army to Taunton, most of which surrendered to Henry VII on 4 October 1497.
Derby ( (listen) DAR-bee) is a city and unitary authority area in Derbyshire, England. It lies on...
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Taganrog (Russian: Таганрог, IPA: [təɡɐnˈrok]) is a port city in Rostov Oblast, Russia, on the...