Alpha Centauri
- Trinary star system consisting of Alpha Centauri A, Alpha Centauri B, and Proxima Centauri
- Nearest star system to Sol
- Located in Sector 002 within the Beta Quadrant
- Known as Sei'chi in Romulan language (ENT Novel: Kobayashi Maru)
- Five planets around Alpha Centauri A (TNG Novel: The Buried Age)
- Regular cometary bombardments from the gravitational influence of Proxima Centauri led to both the rise and destruction of numerous civilizations on Alpha Centauri III and VII before colonization (TNG Novel: The Buried Age)
- System colonization history:
- 2088: Alpha Centauri III
- 2101: Proxima Centauri II
- After 2155, by 2269: Alpha Centauri VII
Known Planets
- Alpha Centauri A
- Alpha Centauri III (Alpha Centauri A III)
- Alpha Centauri B
- Alpha Centauri VII (Alpha Centauri B II)
- Proxima Centauri