Size 2

The Death Star was, quite simply, the largest starship ever built. Shaped like an orb, it was 120 kilometers in diameter, the size of a Class IV moon. Its quadanium steel outer hull had two prominent features: an equatorial trench and — on its upper hemisphere — a concave superlaser focus lens. The trench contained ion engines, hyperdrives, and hangar bays; the superlaser had enough power to annihilate entire worlds.

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Star Wars®: Episode IV: A New Hope™ Chapter 5