>>12676776>Are they possible at all?Why not it's simple physics.
As for when we could have done it long time ago, the problem is they add nothing in the short term but require more money, the political decision was to no make one.
A tethered module would have been sufficient and we could have studied the long term effects on the body of smaller gravity like mars.
The ISS took all the money and even the proposed centrifuge module was ditched.
