Space...The Milky Way. The Milky Way is the spiral galaxy where our solar system lives. It is 100,000 light years in diameter and 1000 light years thick at the center of the galactic disk. There are 200-400 billion stars in the Milky Way. Our Sun is 26,400 light years from the galactical center. On a dark night, we can see a faint hazy whitish band of starlight spanning the sky. That band is the Milky Way galaxy.