ocr: AN ORDINARY STAR The Sun is the central star of our solar system. In a luminosity class it is a dwarf, and in an H-R diagram a main sequence star with a spectral class of G2. The Sun is The Sun is one among the 300 billion stars in our located in a spiral Galaxy known by the name Milky Way. The arm of our Galaxy, in distance fo the galactic centre is 30,000 light- the so-called Orion's years. The Sun orbits around the centre of the arm, some 30,000 Milky Way in about 225 million years, which light-years from From the The equals picture to one 220 above galactic is kilometres an year. per ortis ...
