The Star called the Sun.

The Sun as the star Diameter 1 391 980 km Sidereal period of the equator rotation 25,380 days Luminous emittance 3,88*10^26 watt The visible star value -26,58^m Spectrum class G2 V The effective temperature of the surface 5807 K Age is near 5 billion years The average distance from the Earth to the Sun 149 597 870 km Mass 1,989*10^30 kg

Our Sun is a typical star-dwarf of a spectrum class G2 - this is the great shining gas sphere with complicated internal structure without strict boarder - its density is decreasing step by step. But owing to photosphere (Greek “the light sphere” the thickness) of which is less than 300 km, the observer thinks that the Sun has a "surface".

The chemical composition taken from the solar spectrum: hydrogen is about 90%, helium - 10%, the rest elements - less than 0,1% (according to the number of atoms). The Solar energy sourse is the core transformation of the Sun, where temperature is 15 000 000 K. The energy from inside is carried by irradiation and then in the external layer with 0,2 Ra of thikness - by convection. With the convective movement of plasma many space occurences are connected such as: photosphere gravitation, the Solar spots etc. The intensity of plasma processes on the Sun is periodically changed (11-year period; see the item "The Solar activity").