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In the mid-1970s, the physicist Gerard O'Neill was reflecting on humanity's deep future in space – and concluded that his peers were thinking about it wrong. Lots of people talked about settling other planets, but he realised that there wasn't actually that much suitable real estate within the Solar System. Much of the planetary surface for building settlements exists within harsh, punishing atmospheres, and since rocky worlds and moons have gravity, going back and forth would be fuel-intensive.

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