While death caused the greatest ripples in the Force, many other developments in the Force caused disturbances such as alignment shifts. One such disturbance was sensed by Master Luke Skywalker when he no longer felt the dark side aura around the Massassi Temple and, years earlier, when he felt great power coming from a cave during his training on Dagobah. In 9 ABY, Leia Organa Solo sensed this when she passed through the place in orbit around Endor where Emperor Palpatine had died. Luke and Mara Jade also sensed this in his former palace. In the aftermath of the Battle of Hoth, Palpatine sensed a disturbance in the Force from Luke Skywalker's Jedi potential, and demanded that Darth Vader, who had also felt it, make contact with him on the matter.