Death Star
The Death Star is a type of fictional mobile space station and galactic superweapon featured in the "Star Wars" space opera franchise. The first Death Star is stated to be more than 100 km to 160 km in diameter, depending on source. It is crewed by an estimated 1.7 million military personnel and 400,000 droids. The second Death Star is significantly larger, between 160 km to 900 km in diameter depending on source, and technologically more powerful than its predecessor. Both versions of these moon-sized fortresses are designed for massive power-projection capabilities, capable of destroying multiple naval fleets or entire planets with one blast from their superlasers.
Galactic Empire (Star Wars)
The Death Star, a moon-sized battle station with sufficient firepower to destroy an entire planet, is designed to be the supreme weapon of the Empire's power. Grand Moff Willhuff Tarkin, the station's commander, shortly after informing the heads of the Imperial Military that Palpatine has dissolved the Senate, demonstrates that power in "A New Hope", when he destroys Alderaan merely as a show of force. In the film's climactic scene, however, the station is assaulted by a small force of Rebel starfighters who have come into possession of the station's blueprints. The battle ends with the Death Star's destruction at the hands of Luke Skywalker, which is the Rebel Alliance's first major success against the Empire.