 This series, rife with prophecies, religious zealotry, racial tensions, social pressures and political rivalries, is centered on the eponymous Babylon 5 space station, a five-mile long O'Neill cylinder (see graphic) located in the Epsilon Eridani star system at the fifth Lagrangian point between the fictional planet "Epsilon III" and its moon.In this fictional universe, Epsilon III is the site of an ancient alien machine-city - known as the Great Machine - that is more than once instrumental to the plot of the show that revolves around galactic-level wars and politics.Epsilon Eridani is referred to as a location in space or the center of a planetary system unusually often in fiction.