
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.
Naha | |
---|---|
State | |
Country | |
Capital | |
Population | 319167 |
Naha (那覇市, Naha-shi, Japanese: [naꜜha], Okinawan: Nāfa or Nafa) is the capital city of the Okinawa Prefecture, the southernmost prefecture of Japan.
As of 1 June 2019, the city has an estimated population of 317,405 and a population density of 7,939 persons per km2. The total area is 39.98 km2.
Naha is a city on the East China Sea coast of the southern part of Okinawa Island, the largest of Okinawa Prefecture.
Campo Belo (Portuguese for "beautiful field") is a city located in Minas Gerais state,...
El Oso (Spanish for The Bear), released in 1998 (see 1998 in music), is the third and final...
This page presents a list of the longest road tunnels of the world. This page lists all road...
Nevada (, Spanish: [neˈβaða]) is a state in the Western region of the United States. It is...