? ... the so called known galaxy? Is there an unknown so called galaxy? Is it that you don't believe in galaxies or the Milky Way? I've not heard much controversy surrounding the concept. I think most people refer to the so called known galaxy as the Milky Way. Is there some other theory you are referring to? Wiki says this: The Milky Way is a barred spiral galaxy that has a diameter usually considered to be about 100,000–120,000 light-years but may be 150,000–180,000 light-years. The Milky Way is estimated to contain 100–400 billion stars although this number may be as high as one trillion. There are likely at least 100 billion planets in the Milky Way. The Solar System is located within the disk, about 27,000 light-years from the Galactic Center, on the inner edge of one of the spiral-shaped concentrations of gas and dust called the Orion Arm. The stars in the inner ≈10,000 light-years form a bulge and one or more bars that radiate from the bulge. The very center is marked by an intense radio source, named Sagittarius A, which is likely to be a supermassive black hole.