MSFC Marshall Space Flight Center NPV Net Present Value OECD Organization for Economic Cooperation and Development OSAT Office of Space Access and Technology OTV Orbital Transfer Vehicle PMAD Power Management And Distribution PRS Power Relay Satellite PV Photovoltaic RLV Reusable Launch Vehicle SEP Solar Electric Propulsion SPS Solar Power Satellite SSM Space Segment Model SSO Sun Synchronous Orbit SSP Space Solar Power SSTO Single Stage to Orbit TSTO Two Stage to Orbit WPT Wireless Power Transmission
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