In the 1970s, he developed a plan to build human settlements in outer space, including a space habitat design known as the O'Neill cylinder.

His space station design is known as the O'Neill cylinder.

He wrote about the O'Neill cylinder in "The Colonization of Space".

Its design is a variation of an O'Neill cylinder.

L5 (miniseries) of 2012, features an abandoned O'Neill cylinder.

Babylon 5 is an O'Neill cylinder five miles long and a half-mile to a mile in diameter.

A topopolis has been compared to an O'Neill cylinder extended in length so that it encircles a star.

This configuration has since been known as the O'Neill cylinder.

Explorers discover that the huge vessel is a hollow world-environment in the style of an O'Neill cylinder.

The O'Neill cylinder is yet another space colony proposal.