The purpose of this agreement is to delineate the authorities and responsibilities of the Department of Energy (DOE) and the National Aeronautics and Space Administration (NASA) (the parties) in the research, technology development, design, production, delivery, space vehicle integration, and launch phases with respect to certain radioisotope power systems, including Radioisotope Thermoelectric Generators (RTGs) and Radioisotope Heater Units (RHUs), and to establish an agreement pursuant to which DOE and NASA will perform certain functions and provide funds for certain portions of the undertakings covered hereby. DOE is acting pursuant to the Atomic Energy Act of 1954 as amended and the Department of Energy Organization Act, 42 U.S.C. 7101, et seq. NASA is acting pursuant to the National Aeronautics and Space Act of 1958 as amended, 42 U.S.C. 2473 (c) (6). As used in this document, "space vehicle" shall mean the launch vehicle and the spacecraft.