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NASA is exploring many types of power source technologies. One discussed in this paper is a new high efficiency, low mass, energy converter to replace the present thermoelectric converter in the radioisotope thermoelectric generator (RTG). This new technology converter will allow the number of radioisotope-fueled heat sources and the mass to be reduced. NASA and DOE plan a cooperative team effort with industry, government laboratories and universities to develop a near term, low cost, low power (100 W electric class), low mass ( |