I'm creating a full-fledged galactic republic, in a galaxy not so very different from our own. It's designed to encompass the majority of the stellar systems in the galaxy, including some of the globular clusters orbiting outside the galactic plane. I'm aware that a galactic government of any sort will face logistical challenges, but I'd like to have a capital planet nonetheless, à la the Coruscant of Star Wars (though preferably not a city planet).
I have some ideas for the planet itself, but I'm still trying to figure out where to put it. A central location makes it easier to get to all parts of the republic in reasonable times, with faster-than-light travel, but it risks creating a prosperous bubble that could alienate other parts of the republic. I could put it somewhere on the outer rim of the galaxy, but that makes it inaccessible and gives it an even more isolationist feeling. Setting the capital somewhere in between is yet another option.
I do have some criteria I'd like to evaluate answers on:
- The ability to get to most parts of the galaxy in a reasonably short time (assume that travel may be faster than light but still finite in speed).
- The amount and type of resources available (e.g. hydrogen gas available to be harvested for fuel; element distribution was discussed here). The capital should be in a place that's fairly prosperous.
- The stability and safety of a planet in such a region. Places prone to stellar collisions are not good choices! Additionally, placing the planet near the supermassive black hole is likely not a good idea.
Bearing these criteria in mind, where should I put the galaxy's capital? Near the center, the outer rim, in between, the halo, a globular cluster, or somewhere completely different? In a stellar cluster, molecular cloud, or in a lone system?