Sun vs Ribeirão Preto

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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.

In its core the Sun currently fuses about 600 million tons of hydrogen into helium every second, converting 4 million tons of matter into energy every second as a result. This energy, which can take between 10,000 and 170,000 years to escape the core, is the source of the Sun's light and heat. When hydrogen fusion in its core has diminished to the point at which the Sun is no longer in hydrostatic equilibrium, its core will undergo a marked increase in density and temperature while its outer layers expand, eventually transforming the Sun into a red giant. It is calculated that the Sun will become sufficiently large to engulf the current orbits of Mercury and Venus, and render Earth uninhabitable – but not for about five billion years. After this, it will shed its outer layers and become a dense type of cooling star known as a white dwarf, and no longer produce energy by fusion, but still glow and give off heat from its previous fusion. The enormous effect of the Sun on Earth has been recognized since prehistoric times. The Sun has been regarded by some cultures as a deity. The synodic rotation of Earth and its orbit around the Sun are the basis of solar calendars, one of which is the predominant calendar in use today.

Source: Wikipedia

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Ribeirão Preto (Portuguese pronunciation: [ʁibejˈɾɐ̃w ˈpɾetu]) is a municipality and a metropolitan area located in the northeastern region of São Paulo state, Brazil. Ribeirão Preto is the eighth-largest municipality in the State with 650.9 km2. It has an estimated population of 674,534 in 2018 and a metropolitan area of 1,178,910. It is located 313 km (194 mi) from the city of São Paulo and 706 km (439 mi) from Brasília, the federal capital. Its mean altitude is 526.8 meters (1,728 feet) high. The city's average temperature throughout the year is 23 °C (73F), and the original predominant vegetation is the Atlantic forest. The city was originated around 1856 as an agricultural region. Coffee was a primary income source until 1929 when it lost value compared with the industrial sector.

In the second half of the 20th century, investment in health, biotechnology, bioenergy, and information technology led to the city being declared a Technological Center in 2010. These activities have caused the city to have the 30th biggest gross national (GNP) in Brazil. The city is also an important cultural center. The Prefeito Luiz Roberto Jábali Park, the Maurilio Biagi Park, Carlos Raya Park, Santa Tereza Reserve, and the Zoo are important preservation areas. Pinguim Beerhouse, Dom Pedro Theatre, and projects such as Ribeirão Preto's Cinema Center are relevant sightseeing points, along with events such as the Agrishow Agricultural Fair, Tanabata Festival, Joao Rock Music Festival, and the National Outdoor Book Fair.

Source: Wikipedia