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)
In "Star Wars", Grand Moff Tarkin explains the Empire's military doctrine of peacekeeping, internal security, and counter-insurgency; describing its state terrorism-philosophy as ""rule through fear of force rather than force itself"". The instrument of this power is the military, which includes the Imperial Stormtroopers, a massive fleet of 25,000 Star Destroyers, and the Death Star, a moon-sized superweapon capable of destroying entire planets. Plans for the Death Star first appear (in universe chronology) in "Attack of the Clones" and construction begins at the end of "Revenge of the Sith".