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Stirling Radioisotope Power Systems (RPS) are being developed as an option to provide power on future space science missions where robotic spacecraft will orbit, fly by, land, or rove. A variety of mission concepts have been studied by NASA and the U.S. Department of Energy that would utilize RPS for landers, probes, and rovers and only require milliwatts to tens of watts of power. These missions would contain science measuring instruments that could be distributed across planetary surfaces or near objects of interest where solar is flux insufficient for using solar cells. A low-power Stirling convertor is being developed at NASA Glenn Research Center to provide an RPS option for future low-power applications. Initial concepts convert heat available from several radioisotope heater units to electrical power for spacecraft instruments and communication. Initial development activity includes defining and evaluating a variety of Stirling configurations and selecting one for detailed design, research of advanced manufacturing methods that could simplify fabrication, evaluating thermal interfaces, characterizing components and subassemblies to validate design codes, and preparing for an upcoming proof-of-concept demonstration in a laboratory environment.