O'Neill envisioned the next generation of space habitat as a larger version of Island One. Island Two would be approximately 1800 meters in diameter, yielding an equatorial circumference of nearly six and a half kilometers (four miles). At this size, the habitat could comfortably house a population of some 140,000 people. The size was driven by economics: the habitat was to be small enough to allow for efficient transportation within the habitat and large enough to support an efficient industrial base.
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