The only unambiguously supersonically expanding system known consists of the inner lobes of the low-power radio galaxy Centaurus A which are probably a result of a comparatively recent outburst of the active nucleus.
O único sistema en expansión inequivocamente supersónica coñecido son os lobos internos da radiogalaxia de baixa potencia Centaurus A, que son probablemente o resultado dunha explosión comparativamente recente do núcleo activo.