What is sun?

  • (noun): A typical star that is the source of light and heat for the planets in the solar system.
    Example: "The sun contains 99.85% of the mass in the solar system"
    See also — Additional definitions below


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.

Read more about Sun.

Some articles on sun:

Efnysien - Character Analysis
... 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 ... 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 ...
Sun - Observation and Effects
... 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 ... on whether one looks directly at the Sun ...
Yellow Sun
... Yellow Sun was the first British operational high-yield strategic nuclear weapon ... only to the outer casing the warhead (or physics package) was known as "Green Grass" (in Yellow Sun Mk.1) and "Red Snow" (in Yellow Sun Mk.2) ...
Geocentric Model - Geocentrism and Rival Systems
... to have proposed that both Venus and Mercury went around the Sun rather than the Earth, but this is no longer accepted ... Martianus Capella definitely put Mercury and Venus in orbit around the Sun ... He wrote a work, 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 ...
Ze Rong - Biography - Service Under Liu Yao
... When 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 ...

More definitions of "sun":

  • (noun): A person considered as a source of warmth or energy or glory etc.
  • (noun): First day of the week; observed as a day of rest and worship by most Christians.
    Synonyms: Sunday, Lord's Day, Dominicus
  • (noun): The rays of the sun.
    Example: "The shingles were weathered by the sun and wind"
    Synonyms: sunlight, sunshine
  • (verb): Expose one's body to the sun.
    Synonyms: sunbathe
  • (noun): Any star around which a planetary system evolves.

Famous quotes containing the word sun:

    Sunday morning may be cheery enough, with its extra cup of coffee and litter of Sunday newspapers, but there is always hanging over it the ominous threat of 3 P.M., when the sun gets around to the back windows and life stops dead in its tracks.
    Robert Benchley (1889–1945)

    From this elevation, just on the skirts of the clouds, we could overlook the country, west and south, for a hundred miles. There it was, the State of Maine, which we had seen on the map, but not much like that,—immeasurable forest for the sun to shine on, the eastern stuff we hear of in Massachusetts. No clearing, no house. It did not look as if a solitary traveler had cut so much as a walking-stick there.
    Henry David Thoreau (1817–1862)

    But a mother is like a broomstick or like the sun in the heavens, it does not matter which as far as one’s knowledge of her is concerned: the broomstick is there and the sun is there; and whether the child is beaten by it or warmed and enlightened by it, it accepts it as a fact in nature, and does not conceive it as having had youth, passions, and weaknesses, or as still growing, yearning, suffering, and learning.
    George Bernard Shaw (1856–1950)