http://www.pbs.org/wgbh/nova/space/gravity-forces.html www.pbs.org/...gravity-forces.html to withstand around 2 or 3 G's around 2 or 3 G's NOVA | All About G Forces NOVA | All About G Forces www.pbs.org/...gravity-forces.html http://www.pbs.org/wgbh/nova/space/gravity-forces.html weighed more than 3,500 kilograms (7,700 lb) http://www.pbs.org/wgbh/nova/space/gravity-forces.html