Antioch vs Sun

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Antioch on the Orontes (; Ancient Greek: Ἀντιόχεια ἡ ἐπὶ Ὀρόντου, Antiókheia hē epì Oróntou; also Syrian Antioch) was an ancient Greek city on the eastern side of the Orontes River. Its ruins lie near the current city of Antakya, Turkey, to which the ancient city lends its name. Antioch was founded near the end of the fourth century BC by Seleucus I Nicator, one of Alexander the Great's generals. The city's geographical, military, and economic location benefited its occupants, particularly such features as the spice trade, the Silk Road, and the Royal Road. It eventually rivaled Alexandria as the chief city of the Near East. The city was the capital of the Seleucid Empire until 63 BC, when the Romans took control, making it the seat of the governor of the province of Syria. From the early fourth century, the city was the seat of the Count of the Orient, head of the regional administration of sixteen provinces. It was also the main center of Hellenistic Judaism at the end of the Second Temple period.

Antioch was one of the most important cities in the eastern Mediterranean half of the Roman Empire. It covered almost 1,100 acres (4.5 km2) within the walls of which one quarter was mountain, leaving 750 acres (3.0 km2) about one-fifth the area of Rome within the Aurelian Walls. Antioch was called "the cradle of Christianity" as a result of its longevity and the pivotal role that it played in the emergence of both Hellenistic Judaism and early Christianity. The Christian New Testament asserts that the name "Christian" first emerged in Antioch. It was one of the four cities of Seleucis of Syria, and its residents were known as Antiochenes. The city may have had up to 250,000 people during Augustan times, but it declined to relative insignificance during the Middle Ages because of warfare, repeated earthquakes, and a change in trade routes, which no longer passed through Antioch from the far east following the Mongol invasions and conquests.

Source: Wikipedia

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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