Sun

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The Sun formed about 4.567 billion[a] 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 stars
form by this process. The Sun is a G-type main-sequence star (G2V) based on
spectral class and it is informally designated as a yellow dwarf because its
visible radiation is most intense in the yellow-green portion of the spectrum,
and although it is actually white in color, 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 about 620 million metric tons of hydrogen
each second.