ocr: ASTAR CALLED SUN The central star of our Solar system. Iti is a dwarf, and a main sequence star in an H-R diagram, with a spectral class of G2.The Sun is located in a spiral arm of the Milky Way, in the so-called Orion's arm, some 30,000 light-years from its centre. The distance to the Sun is 150 million km, i.e. some 8 light-minutes. The Sun is 1.4 million km in diameter (about three times the distance from the Earth to the Moon) and its mass is 333,000 times the mass of Earth. The Sun consists of 78% hydrogen, 20% helium and about 2% of other heavier elements. The dark spots in the picture a ...
