General information of sun

The sun as it appears all the way through a camera lens from the surface of Earth. The Sun is confidential as a main sequence star, which means it is in a state of "hydrostatic balance", neither contracting or expanding, and is generating its energy through nuclear fusion of hydrogen nuclei into helium. The Sun has a spectral class of G2V, with the G2 importance that its color is yellow and its spectrum contains spectral lines of ionized and neutral metals as well as very weak hydrogen lines and the V signifying that it, like most stars, is a "dwarf" star on the main sequence.

The Sun has a predicted main series lifetime of about 10 billion years. Its current age is consideration to be about 4.5 billion years, a figure which is determined using computer models of stellar evolution, and nucleocosmochronology . The Sun orbits the midpoint of the Milky Way galaxy at a distance of about 25,000 to 28,000 light-years from the galactic centre, completing one revolution in about 226 million years. The orbital speed is 217 km/s, the same to one light year every 1400 years, and one AU every 8 days.