When you look up at the night sky, it seems it's filled with stars. But you're only seeing a tiny, tiny fraction of all the stars in the Milky Way. Our galaxy is a disk 100,000 light years across, and with only a handful of exceptions, all the stars you see are less than 1000 light years away. Most are far closer than that! At best, you're seeing a few thousand stars out of the hundreds of billions in the Milky Way, a paltry fraction of 0.000003%!