Death Star
The first Death Star is depicted in various sources of having a crew of 265,675, as well as 52,276 gunners, 607,360 troops, 30,984 stormtroopers, 42,782 ship support staff, and 180,216 pilots and support crew. Its hangars contain assault shuttles, blastboats, Strike cruisers, land vehicles, support ships, and 7,293 TIE fighters. It is also protected by 10,000 turbolaser batteries, 2,600 ion cannons, and at least 768 tractor beam projectors. Various sources state the first Death Star has a diameter of between 140 and 160 kilometers. There is a broader range of figures for the second Death Star's diameter, ranging from 160 to 900 kilometers.
Death Star
The anthology film "Rogue One" focuses on a band of Rebels stealing the plans for the first Death Star prior to the events of "A New Hope". The Death Star project was overseen by Orson Krennic, the Director of Advanced Weapons Research for the Imperial Military. Under Krennic's supervision, the project was beset by constant delays, and he forcibly recruited weapons designer Galen Erso (the father of Jyn Erso, the movie's main protagonist) to complete the design; nevertheless, it was another fifteen years before the Death Star was operational. The Death Star's primary laser was powered by kyber crystals mined from the desert moon of Jedha, and is first used to destroy Jedha City both as a response to a violent insurgency on the planet, and as a display of the Death Star's operational status to restore the Empire's confidence in the project. Grand Moff Tarkin assumes control over the Death Star while Krennic investigates security breaches in the design project. It is subsequently revealed that Galen discreetly sabotaged the design by building a vulnerability into the reactor. This is the same vulnerability that Luke Skywalker takes advantage of during the events of "A New Hope". After the Death Star plans are stolen from the Scarif vault, Tarkin fires the Death Star laser on the base killing Krennic, as well as Jyn Erso and Cassian Andor.