( except that of course you ca n't have a final frontier , because there 'd be nothing for it to be a frontier to , but as frontiers go , it 's pretty penultimate ... ) and against the wash of stars a nebula hangs , vast and black , one red giant gleaming like the madness of gods ... and then the gleam is seen as the glint in a giant eye and it is eclipsed by the blink of an eyelid and the darkness moves a flipper and great a'tuin , star turtle , swims onward through the void .