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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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Vitoria-Gasteiz (; Spanish: [βiˈtoɾja]; Basque: [ɡas̺teis̻]) is the seat of government and the capital city of the Basque Country and of the province of Araba/Álava in northern Spain. It holds the autonomous community's House of Parliament, the headquarters of the Government, and the Lehendakari's (Prime Minister's) official residency. The municipality—which comprises not only the city but also the mainly agricultural lands of 63 villages around—is the largest in the Basque Country, with a total area of 276.81 square kilometres (106.88 sq mi), and it has a population of 252,571 (May 2019). The dwellers of Vitoria-Gasteiz are called vitorianos or gasteiztarrak, while traditionally they are dubbed babazorros (Basque for 'bean sacks').
Vitoria-Gasteiz is a multicultural city with strengths in healthcare, aeronautics, vehicle industry, and gastronomy. It is consistently ranked as one of the 5 best places to live in Spain, it is the first Spanish municipality to be awarded the title of European Green Capital (in 2012) and it has been also recognized by the UN with the Global Green City Award (in 2019). The old town has some of the best preserved medieval streets and plazas in the region and it is one of very few cities with two cathedrals.
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