Depth

“It was hard to visualize the scope of the whole orb. Big didn't begin to do it justice. The habitable crust alone was two kilometers thick, and included in it the surface city sprawls, armory, hangar bays, command center, technical areas, and living quarters. Below that would be the hyperdrive, reactor core, and secondary power sources-none of which, fortunately, concerned her.

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Star Wars: Death Star Part 1 Chapter 15