Pluto — dwarf planet in the Kuiper Belt. Site of the first confirmed non-human artifacts in the solar system, discovered by UNS Tsiolkovsky in December 2131: a downed alien vessel on the surface, a subsurface facility with a domed chamber and differentiated seat that produced a cognitive event in Commander Jakub Novák, and the Charon Anchor in orbit of its largest moon. By 2139, seven identical subsurface installations had been located across the surface. Placed under permanent UN restriction. Canteloupe stationed as permanent research/security presence.
In 2140, Secretary-General Immanuel Hansen announced that, per a CAI recommendation, Dominium Hominis pilgrims would be granted supervised access to the subsurface facility beginning March 2, 2140. He floated a timeline of ~2148 for converting the site into a public museum, with the Office for Colonial Development planning permanent surface habitation. The 2165 Colonial Census recorded ~45,000 residents: Persephone Reach ~36,000, Canteloupe ~4,800, and ~4,200 across the surface habitat complex around the xenosites (museum complex, pilgrim quarters, research wings) — growth driven by continued Dominium Hominis migration to permanent residence, the museum conversion, and the region’s role as staging for Kuiper Belt operations.