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In order to meet the challenging thermal analysis needs of Space Station Freedom and other proposed Space Exploration Initiative missions, a new generation of thermal analysis tools, utilizing the latest advances in user-interface design, software engineering approaches, graphics capability, CPU speed, and networking technology will be needed. NASA Johnson Space Center has commissioned the development of the Thermal Synthesizer System (TSS) to meet these difficult analysis requirements. TSS is being developed by Lockheed Missiles and Space Company, Lockheed Engineering Sciences Company, and NASA Johnson Space Center. The system consists of integrated applications to perform: surface and solid modeling, radiation coupling, orbital analysis, characterization of the thermal radiation heating environment for a spacecraft in orbit or on a planet surface, conduction network generation, two-phase flow modeling and analysis, temperature predictions, and general purpose post-processing.