Save others the burden of a couple of clicks / taps. An O'Neill cylinder would consist of two counter-rotating cylinders. The cylinders would rotate in opposit

Save others the burden of a couple of clicks / taps. An O'Neill cylinder would consist of two counter-rotating cylinders. The cylinders would rotate in opposite directions to cancel any gyroscopic effects that would otherwise make it difficult to keep them aimed toward the Sun. Each would be 5 miles (8.0 km) in diameter and 20 miles (32 km) long, connected at each end by a rod via a bearing system. Their rotation would provide artificial gravity. https://en.m.wikipedia.org/wiki/O%27Neill_cylinder https://en.m.wikipedia.org/wiki/O%27Neill_cylinder