Zone A

As per initial findings, Science Officer … confirms that the isolated ruin seen from orbit is indeed the only evidence of settlement on …. Unfortunately, the … crew is little the wiser for having investigated the structures firsthand. Devoid of any other traces of sapient lifeforms, … possesses a zone of roughly thirteen by thirteen kilometers, dubbed Zone A, in which the remains of buildings can be found. Artifacts possessing bizarre properties litter this zone, from minute forcefield generators to viscous fluids that melt through steel and expand over time. Even more peculiar: the entire zone permeates its visitors with a deep-rooted sense of contentment, despite the often-dangerous mysteries of the objects found therein. … posits the working theory that a space-faring civilization visited … sometime in the past, leaving behind these objects - though who they were, why they landed, and why they left remain unknown.

The command below will trigger the "Zone A" event in Stellaris:

When this event fires, you can choose between the following option:

• Fascinating.
  • Zone A has been discovered on ….
  • Engineering: +None to None
  • Physics: +None to None
  • Unity: +None to None

Stellaris events fire in chains — one event leads to the next. Here is how Zone A (distar.220) connects.