The O’Neill Cylinder

The O’Neill Cylinder is a space settlement (also called orbital colony) designed by Princeton physicist Gerard K. O’Neill.

It was design to help human with the colonization of space during the 21st century.

The prototype consists of two cylinders rotating in opposing direction in order to cancel out gyroscopic effects.

![O’Neill Cylinder interior](./static/oneill-cylinder-interior.jpeg)

Each cylinder has three land areas alternating with three windows and three mirrors that open and close to form a day and night cycle.

Real Proposal

As of this writting, the only real proposal that I know of is Jeff Bezos’s Blue Origin. The company asks the question: “what if we built our own planets, our O’Neill Worlds”?


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