The Sun is the star at the center of the Solar System. It is almost perfectly spherical and consists of hot plasma interwoven with magnetic fields. It has a diameter of about 1,392,684 km, about 109 times that of Earth, and its mass (about 2×1030 kilograms, 330,000 times that of Earth) accounts for about 99.86% of the total mass of the Solar System. Chemically, about three quarters of the Sun's mass consists of hydrogen, while the rest is mostly helium. The remainder (1.69%, which nonetheless equals 5,628 times the mass of Earth) consists of heavier elements, including oxygen, carbon, neon and iron, among others.
The Sun formed about 4.6 billion years ago from the gravitational collapse of a region within a large molecular cloud. Most of the matter gathered in the center, while the rest flattened into an orbiting disk that would become the Solar System. The central mass became increasingly hot and dense, eventually initiating thermonuclear fusion in its core. It is thought that almost all other stars form by this process. The Sun's stellar classification, based on spectral class, is G2V, and is informally designated as a yellow dwarf, because its visible radiation is most intense in the yellow-green portion of the spectrum and although its color is white, from the surface of the Earth it may appear yellow because of atmospheric scattering of blue light. In the spectral class label, G2 indicates its surface temperature of approximately 5778 K (5505 °C), and V indicates that the Sun, like most stars, is a main-sequence star, and thus generates its energy by nuclear fusion of hydrogen nuclei into helium. In its core, the Sun fuses 620 million metric tons of hydrogen each second.
Once regarded by astronomers as a small and relatively insignificant star, the Sun is now thought to be brighter than about 85% of the stars in the Milky Way galaxy, most of which are red dwarfs. The absolute magnitude of the Sun is +4.83; however, as the star closest to Earth, the Sun is the brightest object in the sky with an apparent magnitude of −26.74. The Sun's hot corona continuously expands in space creating the solar wind, a stream of charged particles that extends to the heliopause at roughly 100 astronomical units. The bubble in the interstellar medium formed by the solar wind, the heliosphere, is the largest continuous structure in the Solar System.
The Sun is currently traveling through the Local Interstellar Cloud (near to the G-cloud) in the Local Bubble zone, within the inner rim of the Orion Arm of the Milky Way galaxy. Of the 50 nearest stellar systems within 17 light-years from Earth (the closest being a red dwarf named Proxima Centauri at approximately 4.2 light-years away), the Sun ranks fourth in mass. The Sun orbits the center of the Milky Way at a distance of approximately 24,000–26,000 light-years from the galactic center, completing one clockwise orbit, as viewed from the galactic north pole, in about 225–250 million years. Since our galaxy is moving with respect to the cosmic microwave background radiation (CMB) in the direction of the constellation Hydra with a speed of 550 km/s, the Sun's resultant velocity with respect to the CMB is about 370 km/s in the direction of Crater or Leo.
The mean distance of the Sun from the Earth is approximately 149.6 million kilometers (1 AU), though the distance varies as the Earth moves from perihelion in January to aphelion in July. At this average distance, light travels from the Sun to Earth in about 8 minutes and 19 seconds. The energy of this sunlight supports almost all life on Earth by photosynthesis, and drives Earth's climate and weather. The enormous effect of the Sun on the Earth has been recognized since prehistoric times, and the Sun has been regarded by some cultures as a deity. An accurate scientific understanding of the Sun developed slowly, and as recently as the 19th century prominent scientists had little knowledge of the Sun's physical composition and source of energy. This understanding is still developing; there are a number of present day anomalies in the Sun's behavior that remain unexplained.
Other articles related to "sun":
... Heraclides Ponticus was once thought to have proposed that both Venus and Mercury went around the Sun rather than the Earth, but this is no longer accepted ... definitely put Mercury and Venus in orbit around the Sun ... which has not survived, on heliocentrism, saying that the Sun was at the center of the universe, while the Earth and other planets revolved around it ...
... Yellow Sun was the first British operational high-yield strategic nuclear weapon ... the warhead (or physics package) was known as "Green Grass" (in Yellow Sun Mk.1) and "Red Snow" (in Yellow Sun Mk.2) ...
... Liu Yao was engaged in conflict with the rising Sun Ce, Ze Rong served as one of the former's allies, camping near Moling with Xue Li ... They were routed by Sun Ce and forced to retreat, though Ze Rong managed to avoid complete annihilation due to Fan Neng and Yu Mi's hinder on Sun Ce's forces ... During one battle, Sun Ce suffered an arrow wound and returned to his base at Niuzhu ...
... The brightness of the sun can cause pain from looking at it with the naked eye, although doing so for brief periods is not hazardous for normal, non-dilated eyes ... Looking directly at the Sun causes phosphene visual artifacts and temporary partial blindness ... but this depends on general exposure to solar UV, not on whether one looks directly at the Sun ...
... and therefore the sacrifice actually was a dedication of Gwern to a Sun cult, as Celts worshipped Sun by leaping over fires and driving cattle between bonfires during Beltain ... retriggered an onslaught was that Irish did not approve when their prince was kidnapped for the Sun cult ... Thus Virpiranta sees Efnisien as a Sun god and therefore the Welsh equivalent to Esus ...
Famous quotes containing the word sun:
“This night has been so strange that it seemed
As if the hair stood up on my head.
From going-down of the sun I have dreamed
That women laughing, or timid or wild,
In rustle of lace or silken stuff,
Climbed up my creaking stair.”
—William Butler Yeats (18651939)
“Who said it mattered
What monkeys did or didnt understand?
They might not understand a burning-glass.
They might not understand the sun itself.
Its knowing what to do with things that counts.”
—Robert Frost (18741963)
“The sun was not so true unto the day
As he to me.”
—William Shakespeare (15641616)