The Swan Nebula was created several millions years ago when a blue supergiant (spectral class B) burned through all of its light elements and went supernova. Now, all that remains of the system are a beautiful, sky-spanning nebula, several blasted chunks of rock that were once planets, and a highly active pulsar in the center of the system.
The “system” of Swan Nebula has no natural resources of note and no (surviving) lifeforms. Nearly everyone in the system is merely passing through it on their way to New Caledonia or New Lansig. Several sightseeing lines operate in the system (mostly vacation cruisers from New Lansig or Gitten), and a few small research outposts study the stellar phenomenon.
Aside from those transient few, perhaps 5,000 people live a hardscrabble existence salvaging what few rare ores survive in the system. Their lives tend to be lonely and dangerous, and thus they’ve evolved a sort of culture among themselves. Few children are born in Swan Nebula; the people’s numbers are replenished mostly by outcasts and fugitives from the rest of the cluster. A life in Swan Nebula isn’t much fun, but there are few better places to disappear.
Coincidentally, Swan Nebula is the only system that’s been detected in real space by another planet in the cluster. Sensitive telescopes in the Eden system have detected the radio pulses from Swan Nebula’s pulsar, 80,000 light-years away but against all odds in the same galaxy.