Proxima Centauri was a star system near Earth. It was also the star cluster in which Furon, the Furon Homeworld resided. Officially, it was in the triple star system that consisted of Alpha Centauri A, a sun like star, Alpha Centauri B, a larger but still sun like star and Alpha Centauri C or Proxima Centauri, a very small red dwarf. It was approximately 4.43 light years from Earth. Furon orbited around Centauri C, the smaller of the three.
As a red dwarf, Proxima Centauri released massive bursts energy that heavily irradiated Furon, so the Furons needed shields in order to survive.