Alpha Centauri is a triple star system located in the constellation Centaurus. It is the closest star system to our Solar System, located 4.37 light-years away. Alpha Centauri is composed of three stars: Alpha Centauri A, Alpha Centauri B, and Proxima Centauri. Alpha Centauri A and B are a binary star system, while Proxima Centauri is a red dwarf star that orbits the other two stars. Alpha Centauri is often referred to as the 'CENTAUR's Horse' due to its location in the constellation Centaurus.