Abstract: A spacecraft having a plurality of concentric balloons (1a,1b), 1c) as protection means, wherein inside the innermost balloon (1c) is located a spacecraft (2) or living facility for human being, together with adequate gaseous material favorable for such equipment or human activity. The outer balloons having progressively lower gas pressures. The multiple balloon system has improved degree of protection against cosmic vacuum environment, improved degree of prevention of escaping of material, with less pressure difference across each balloon membrane and more mechanical strength as compared with a single balloon system. Strings (3a,3b) or similar support members are placed in each inter-balloon space so as to prevent touching or cling of the balloons.