Rabat vs Sun

Informations

Rabat (, also UK: , US: ; Arabic: الرباط‎, romanized: ar-ribāṭ; Berber languages: ⴰⵕⴱⴰⵟ, romanized: aṛṛbaṭ) is the capital city of Morocco and the country's seventh largest city with an urban population of approximately 580,000 (2014) and a metropolitan population of over 1.2 million. It is also the capital city of the Rabat-Salé-Kénitra administrative region. Rabat is located on the Atlantic Ocean at the mouth of the river Bou Regreg, opposite Salé, the city's main commuter town. Rabat was founded in the 12th century by the Almohad ruler Abd al-Mu'min as a military town. The city steadily grew but went into an extended period of decline following the collapse of the Almohads. In the 17th century Rabat became a haven for Barbary pirates. The French established a protectorate over Morocco in 1912 and made Rabat its administrative center.

Morocco achieved independence in 1955 and Rabat became its capital. Rabat, Temara, and Salé form a conurbation of over 1.8 million people. Silt-related problems have diminished Rabat's role as a port; however, Rabat, and Salé still maintain important textile, food processing and construction industries. In addition, tourism and the presence of all foreign embassies in Morocco serve to make Rabat one of the most important cities in the country. The Moroccan capital was ranked at second place by CNN in its "Top Travel Destinations of 2013". It is one of four Imperial cities of Morocco, and the medina of Rabat is listed as a World Heritage Site. Rabat is accessible by train through the ONCF system and by plane through the nearby Rabat–Salé Airport.

Source: Wikipedia

Informations

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