Just way too big to comprehend.
And were right in it. Even with all of our technology and observations, still can't figure the specific structure. It's so big many don't know when they see the "Milky May" in the night sky, it's actually one of the arms or part of the curved structure of our spiral galaxy.
BTW, how big is our galaxy? It about 600,000 trillion miles from end to end.
With a T.