Abstract: The protective enclosure for a space vehicle with a magnetic propulsion system includes an insulated Dewar vessel formed of walls of superconducting material surrounded and suspended by superconducting magnets. The superconducting walls shield the interior of the enclosure from external magnetic and electric fields, and the superconducting walls and corresponding magnetics act to cushion passengers or equipment within the enclosure from acceleration or gravitational forces. One or more accelerometers are preferably provided for sensing acceleration or gravity in each of the three orthogonal axes of the enclosure, and a control unit is also preferably provided for controlling the superconducting magnets of the enclosure responsive to output signals from the accelerometers.