Todesstern
The effect is seen twice in the 1997 Special Edition of "Star Wars" during the explosions of Alderaan and the first Death Star. It is once again seen in the 1997 Special Edition of "Return of the Jedi" during the explosion of the second Death Star. The 2007 "Star Wars Legends" novel "Death Star" explained the ring effect at Alderaan as the shadow of a hyperspace ripple from firing the superlaser at full charge.