The Milky Way galaxy is a rod spiral galaxy (a kind of spiral galaxy) where the solar system is located. It is in an elliptical disk shape and has a huge disk structure. The latest research shows that the Milky way has four clear and symmetrical spiral arms, which are 4500 light-years apart. The number of stars in the Milky way is between 100 billion and 400 billion.
Viewed from the earth, the center of the Milky way is the brightest area of the Milky way, with its direction in Sagittarius. From Sagittarius, a hazy white band of light seems to pass to the Auriga on the back. The band then continues the rest of the way back to Sagittarius, dividing the celestial sphere into two roughly equal hemispheres.