in towards the interior space: 0.9306 cm thickness shell structure of aluminum 2219, 0.3175 cm lead foil for protection from gamma and alpha rays, 8.4169 cm lucite wastewater membrane for protection from fast neutrons and beta rays, another 0.3175 cm of lead foil, and finally 0.3175 cm of interior wall surface material, for a total exterior wall surface of 10.3 cm. Additional protection is provided by the interior walls which also have two layers of lead foil. [3] Communication. [4] Propulsion is required because of a drag which exists even in this virtually nonatmospheric environment. This could be accomplished either under its own power, or that of the Shuttle orbiter, which could act as a tug. A program could be written which would control the propulsion system, receiving its energy in the form of electricity. [5] Attitude control — SPORE must be stabilized by 3 gyroscopes, e.g., achieved by jets of nitrogen through balancing tubes in a liquid fly-wheel. Roll, pitch, and yaw must be stabilized. A roll will be established to afford more evenly distributed solar heat gain over the entire configuration. Pitch and yaw control will be aimed towards optimizing solar heat exchange to the power system. [6] Vibrations once set into motion have to be dampened, otherwise they will continue indefinitely. Therefore, this criteria dominates the design of structural attachments and supports any design
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