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Such a hab would have only 321 km 2 of real estate but a volume only 2.6e11 cubic meters. 2.6e11 m 3 * 1.27 kg/m 3 = 3.3e11 kilograms. 1.5e18/3.3e11 = ~4.5 million. 4.5 million of the smaller O'Neill habitats. 4.5 million * 321 = 1460 million square kilometers. Or about as much real estate as 10 Mars planets.

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