Only Hillbillies Live In the Outer Rim
“Science fiction often assumes that civilizations which exist on a galaxy’s outer rim will be backwards in nature. It’s a understandable reaction – the “centre” is more sophisticated while the “outlands” are more primitive. For example, in Star Wars, the Outer Rim Territories were sparsely settled and relatively unexplored. In Isaac Asimov’s original Foundation books, the focus of the Galactic Empire is on Trantor at the galactic centre, whilst the Foundation itself is located on the remote planet Terminus at the rim, where other planets are not so scientifically advanced.
But a galactic centre can be a dangerous place. As in our own galaxy, there may be a super-massive black hole to suck matter in. There are more stars in the vicinity, some of which might start throwing out unpleasant things, or even go supernova. Obviously an advanced civilization would know this, and could move away if something goes wrong, but then again why should it? Human beings can live near volcanoes, in earthquake zones, or on flood plains; but if they have a choice they tend to prefer to live somewhere safer in the first instance. Advanced aliens are probably no different.”
Mark Stewart, bis-space.com