A further modification from the rotating dumbbell replaces the spokes with a simple, unpressurized truss. It introduces potential problems, however. Accelerating and braking thrusts must be done slowly, with less force than the centrifugal force holding the tether taut. NASA is currently cautious on tethers. Despite disappointments, tethers appear promising in minimizing weight and rotational rates.
Some designs call for a small centrifuge on board a non-rotating craft.
Given that most of the body s changes appear to be physiologic adaptations to its new environment, perhaps a period of reconditioning before returning to Earth-normal gravity would be better tolerated, more natural . Much work remains to be done before artificial gravity can be effectively employed as a countermeasure to long-duration spaceflight. Requests concerning this Web site should be directed to Jeff Roche , Webmaster. The Mars Society - Ohio Chapter . All rights reserved.