ASRG is a radioisotope power system under development at NASA 's Glenn Research Center .
Electric power to the spacecraft and its scientific payload would be generated by three Advanced Stirling Radioisotope Generators ( ASRG ) .
ASRG is a radioisotope ASRG   under development at NASA 's Glenn Research Center .
Electric power to the spacecraft and its scientific payload would be generated by three Advanced Stirling Radioisotope Generators ( ASRG ) .