Abstract: A habitat module for astronauts traveling in a space vehicle, the habitat module including a cylindrical module enclosing a living compartment for astronauts, the module having a cylindrical outer wall, opposite end walls, and a longitudinal central axis, support bearings mounting the module within the space vehicle for rotation of the module about its longitudinal central axis to create artificial gravity within the module for astronauts occupying the module, a first motor rigidly connected to the space vehicle for rotating the module, a flywheel rotatably connected to the space vehicle adjacent to the module to counter and cancel the inertial forces generated when the module is rotated about the longitudinal central axis of the module, the flywheel having a central longitudinal axis of rotation aligned with the central axis of rotation of the module, a second motor rigidly connected to the space vehicle for rotating the flywheel to counter and cancel the inertial forces generated when the module is rotated,