 The over-mined Klingon moon of Praxis (after which the effect was named) explodes and throws a ring-like shock wave through space, precipitating the events of the film.The same visual effect is seen in the background of the cover of the 1992 comic book "Supreme" #1.The same visual effect appears in the 1993 comedy film Coneheads when Beldar ignites a bottle rocket at a school sporting event.