The ring-shaped space stations The origin of discussions of the "Ringwords" has been started in the 1950s when NASA planned to create the wheel-looking space station, which would create artificial gravity by using the rotation movement, and the thing is that the size of that space station would be approximately 500-600 meters maximum. That space station would be created by using a modular structure, and it would send to space in small bites. Then those bites would dock together to one big entirety. This was the first version of this kind of structure. Then Gerald O'Neill created an idea, that inside the ring-shaped space station would be the vegetables and other things, what would make it look like Earth inside the station. Sometimes this kind of space station would be planned to equip with a nuclear reactor, and it would be planned to use as the "cruiser", what will travel through the solar system. In that "cruiser" the crew can live in