
Privacy
Sun | |
---|---|
State | |
Country | |
Capital | |
Population | 0 |
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.
Cumberland | |
---|---|
State | Maryland |
Country | United States of America |
Capital | |
Population | 20758 |
Postcode | 21502 |
Cumberland ( KUM-bər-lənd) is a historic county of North West England that had an administrative function from the 12th century until 1974. It was bordered by Northumberland to the northeast, County Durham to the east, Westmorland to the southeast, Lancashire to the south, and the Scottish counties of Dumfriesshire and Roxburghshire to the north.
Buraidah (Arabic: بريدة Burayda) is the capital of Al-Qassim Region in northcentral Saudi Arabia...
Vero Beach is a city in and the seat of Indian River County, Florida, United States. It is...
Contamana is a town in the Loreto Region in northeastern Peru. It is the capital of both Ucayali...
Mato Grosso (Portuguese pronunciation: [ˈmatu ˈɡɾosu] – lit. "Thick Bush") is one of...