Yora
Legend
I think where the grand scope of Space Opera really manifests the most is a sense that a single person can never really learn about all the inhabited planets that are theoretically accessible to them. As a space traveler, you could keep going forever and there's always more worlds "beyond the horizon". Of course, a galaxy does have edges, but if you reach one you can just turn the ship around and head into a new direction. You're always only going to see slices of your galaxy, but it's too big visit it all.