A space station is constructed in the shape of a wheel 16 rm m in diameter, with essentially all of its 6.0×105 rm kg mass at the rim. Once the station is completed, it is set rotating at a rate that requires an object at the rim to have radial acceleration g, thereby simulating Earth's surface gravity. This is accomplished using two small rockets, each with 120 rm N thrust, that are mounted on the rim of the station.