This is my space station and the repair drone. If you look at the repair drone cross-eyed, and match the two images, it becomes 3-D. The space station has 2 rings attached to the center. Those rings rotate to create artificail gravity. The rest of the station is stationary, for expirimental purposes. The length of the whole ship is 400 meters, and the radius of both rings is 100 meters. The rotational speed of the rings are matched, and the speed creates exactly 1 of Earths gravitational forces (9.8 meters per second rate of fall). To create 1 of earths gravitational forces, the rings would need to make 5.38 rotations per minute. The eguation I used to figure out the rpms of the station is RPMS=60/(2*3.1415*square root((radius*(30.9/100))/(g-forces*9.8))). The effects of microgravity on a human are the weakening of muscles, so when you return to Earth, you would have to relearn how to walk.