Selgemini

Selgemini is a fictional term used in speculative fiction, tabletop role-playing games, and related media to denote a binary star system and the civilizations associated with it. It is a coined name that evokes dual celestial bodies and shared fates. It is not an established astronomical object in real-world science.

In most treatments, Selgemini features two suns in a close gravitational relationship, with planets that orbit the pair. The dual-star dynamics can create varied climates, long day lengths, and shifting habitable zones, offering fertile ground for world-building, exploration, and conflict. Common arrangements include circumbinary planets, planets tidally influenced by the stellar pair, and complex orbital resonances.

Usage across media varies by author. In science fiction novels, games, and films, Selgemini serves as a setting for political alliances, colonization efforts, and narratives exploring duality, unity, and tipping points between two dominant celestial forces. The term has also been used as a planetary name or as the designation for a faction or civilization grounded in a binary-sun environment.

Etymology and reception: The name Selgemini likely combines allusions to Selene, the Moon, and Gemini, the twins, to signal lunar imagery and duality. As a fictional construct, its specifics are defined by the work in which it appears, and there is no standard canonical depiction.