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Iași (UK: YASH-ee, US: YAHSH(-ee), Romanian: [ˈjaʃʲ] (listen)), also referred to as Jassy (UK: YASS-ee, US: YAH-see), is the second largest city in Romania, and the seat of Iași County. Located in the historical region of Moldavia, Iași has traditionally been one of the leading centres of Romanian social, cultural, academic and artistic life. The city was the capital of the Principality of Moldavia from 1564 to 1859, then of the United Principalities from 1859 to 1862, and the capital of Romania from 1916 to 1918.
Known as The Cultural Capital of Romania, Iași is a symbol in Romanian history. The historian Nicolae Iorga said "There should be no Romanian who does not know of it". Still referred to as The Moldavian Capital, Iași is the main economic and business centre of the Moldavian region of Romania. In December 2018, Iași was officially declared Historical capital of Romania.At the 2011 census, the city proper had a population of 290,422 (making it the fourth most populous in Romania at the time).
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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.