How does a Bernal sphere work?

Bernal Sphere Interior Power would be generated at satellite solar power stations and transmitted by microwave to Earth. Guidice, is known as a “Bernal Sphere.” Houses, lawns, trees, people, and all – a community of some 10,000 people – rest upon the interior surface of a large sphere, nearly a mile in circumference.

What is a Bernal?

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. 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.

How we could actually build a space colony?

Rocketing enough material into space to build a colony would cost big bucks. A better bet: establishing simple manufacturing facilities in space designed to use raw materials mined from the moon or asteroids. The real cost-saver O’Neill envisioned would be installing a large electromagnetic catapult on the moon.

Is O’Neill cylinder possible?

yes…but in practice, it’s very hard to expect it to be true. The problem with an idealized O’Neill cylinder is that in order to function it has to have 100\% perfect recycling…and it’s occupants can only have something new if something old is replaced.

How much would it cost to build O’Neill cylinder?

I’m not sure how much O’Neill thought it would cost, but NASA’s Ames research centre reckoned something like 140 billion dollars in the mid 70s, so maybe 700-800 billion nowadays. A more recent source suggests that it would really cost as much as 10 trillion dollars now.

How fast will an O’Neill cylinder need to rotate in order to create 1g on its surface?

We spin the cylinder at ~0.5rpm to produce 1g of centripetal acceleration on the inner surface, and then we wait for everything to reach some sort of equilibrium-ish state.

Are O’Neill cylinders real?

The Island Three design, better known as the O’Neill cylinder, consists of two counter-rotating cylinders. They are five miles (8.0 km) in diameter and are capable of being scaled up to twenty miles (32 km) long.