OEP Office of Energy Programs/NASA RD&D Research, development and demonstration RDDT&E Research, development, demonstration, test and evaluation RF Radio frequency RFI Radio frequency interference SEB Source evaluation board SED Solar Energy Division/OEP SEPS Solar electric propulsion system SPS Satellite power system or solar power satellite SSTO Single stage to orbit STS Space transportation system UV Ultraviolet radiation VTO Vertical takeoff WMO World Meteorological Organization
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