GW GIGAWATT (109 WATTS) GWe GIGAWATT ELECTRIC HF HIGH FREQUENCY h2 HYDROGEN IMPATT IMPACT AVALANCHE TRANSIT TIME I sp SPECIFIC IMPULSE JPL JET PROPULSION LABORATORY JSC JOHNSON SPACE CENTER KSC KENNEDY SPACE CENTER kV KILOVOLT kW KILOWATT LaRC LANGLEY RESEARCH CENTER LBF POUNDS OF FORCE LEO LOW EARTH ORBIT LeRC LEWIS RESEARCH CENTER Mm MICROMETER MPD MAGNETOPLASMADYNAMICS MPTS MICROWAVE POWER TRANSMISSION SYSTEM MSFC MARSHALL SPACE FLIGHT CENTER MTBF MEAN TIME BETWEEN FAILURE MT METRIC TON MW MEGAWATT (106 WATTS) N NEWTON NASA NATIONAL AERONAUTICS AND SPACE ADMINISTRATION NM NAUTICAL MILES
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