Almost half a century later, Gerard K. O'Neill based the scheme for his "Island One" space colony on a smaller Bernal sphere, some 500 meters in diameter. Rotating twice a minute this would generate an Earth-normal artificial gravity at its equator. An advantage of the sphere is that it has the smallest surface area for a given internal volume, so minimizing the amount of radiation shielding required.
Related entries Dyson sphere
Related category• MANNED SPACEFLIGHT
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