A Bernal sphere is a type of space habitat intended as a long-term home for permanent residents, first proposed in 1929 by John Desmond Bernal. Exterior view. Art work: Rick Guidice. Bernal's original proposal described a hollow non-rotating spherical shell 10 mi (16 km) in diameter, with a target population of 20,000 to 30,000 people.

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Photo credit: © NASA Archive / Alamy / Afripics
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