Death Star
Although details, such as the superlaser's location, shifted between different concept models during production of "Star Wars", the notion of the Death Star being a large, spherical space station over 100 kilometers in diameter was consistent in all of them. George Lucas gave the original task of designing a "Death Star" to concept artist and spaceship modeler Colin Cantwell, who had collaborated with Stanley Kubrick on the 1968 film "". In a 2016 interview, Cantwell related that "I didn't originally plan for the Death Star to have a trench, but when I was working with the mold, I noticed the two halves had shrunk at the point where they met across the middle." As it "would have taken a week of work just to fill and sand and refill this depression," Cantwell suggested a trench to Lucas to save the labor. Lucas liked the idea, and the Death Star model was created by John Stears. The buzzing sound counting down to the Death Star firing its superlaser comes from the "Flash Gordon" serials. Portraying an incomplete yet powerful space station posed a problem for Industrial Light & Magic's modelmakers for "Return of the Jedi". Only the front side of the 137-centimeter model was completed, and the image was flipped horizontally for the final film. Both Death Stars were depicted by a combination of complete and sectional models and matte paintings.
Rebel Alliance
During the events of "Rogue One" and "A New Hope", the Alliance learns of the construction of the "Death Star", an enormous battle station intended to secure the Empire's power. With the help of the "Rogue One" squad led by Jyn Erso and Cassian Andor, the Rebels successfully steal the schematics of the station. This win was the Alliance's first major battle against the Empire on Scarif; but at a 75% casualty rate and with all remaining imperial and rebel forces planetside decimated. After successfully downloading the Death Star plans, Alderaanian soldiers aboard a Mon Calamari flagship barely manage to escape Imperial forces with the stolen data plans. Right after the battle, the "Tantive IV", an Alderaanian corvette carrying Princess Leia Organa is captured by the Imperial fleet while attempting to deliver the Death Star Plans to Bail Organa on Alderaan. All members of the Alderaanian Consular Security onboard are either killed or taken prisoner and Princess Leia Organa is held hostage for a time by Darth Vader. In order to punish both her and her home planet's central involvement in the Rebel Alliance, Leia is forced to witness Alderaan's destruction by the Death Star. The Princess is subsequently rescued by Luke Skywalker, Han Solo, Chewbacca, and Obi-Wan Kenobi, who then deliver the station schematics to the Alliance. This leads directly to the Alliance's victory in the Battle of Yavin and the loyalty of Luke Skywalker; the Rebellion's only remaining member with training in the Force.