The Milky Way Galaxy is composed of matter and antimatter. At the center of the galaxy, there are two massive black holes. One black hole is composed of matter; and the other is antimatter. The black holes are strewing matter and antimatter into space forming a halo and spiral arms of matter and antimatter stars. The sun is one of the billions of stars that are composed of matter. There are a similar number of antimatter stars.

Because light (phtons) coming from both matter and antimatter stars is the same, people make the wrong assumption that all stars are made from matter. In reality, there are similar quantities of matter and antimatter stars.