From The Starfield Wiki
Neon is a pleasure city built by the Xenofresh Corporation on an aquatic world. Originally intended to be a fishing platform, the city was repurposed towards drug production after the discovery of a fish with psychotropic properties. This led to the creation of Aurora, universally outlawed throughout the Settled Systems except in Neon itself. Aurora's unique effects have made the city a major tourist site by those who want to experience it.