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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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Puno (Aymara and Quechua: Punu) is a city in southeastern Peru, located on the shore of Lake Titicaca. It is the capital city of the Puno Region and the Puno Province with a population of approximately 140,839 (2015 estimate). The city was established in 1668 by viceroy Pedro Antonio Fernández de Castro as capital of the province of Paucarcolla with the name San Juan Bautista de Puno.
Babie (Hungarian: Bábafalva) is a village and municipality in the Vranov nad Topľou District in...
Delft (Dutch pronunciation: [dɛlft] (listen)) is a city and municipality in the province of South...
Rouyn-Noranda (2011 population 41,012) is a city on Osisko Lake in the Abitibi-Témiscamingue...