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 DDCU:      DC-to-DC Converter Unit 
 DDTE:      Design, Development, Test, and Evaluation 
 DFRC:      Dryden Flight Research Center 
 DFRF:      Dryden Flight Research Facility (was ADFRF, now DFRC) 
 DMSP:      Defense Meteorological Satellite Program 
 DOD:       Department Of Defense (sometimes DoD) 
 DOE:       Department Of Energy 
 DOT:       Department Of Transportation 
 DRS:       Data Relay Satellite 
 DRS:       Direct Receiving Station 
 DSO:       Deep Sky (or Space) Object 
 DSCS:      Defense Satellite Communications System 
 DSN:       Deep Space Network 
 DSP:       Defense Support Program (USAF/NRO) 
 EAC:       European Astronaut Centre 
 EAFB:      Edwards Air Force Base 
 ECS:       Environmental Control System 
 EDO:       Extended Duration Orbiter 
 EGRET:     Energetic Gamma Ray Experiment Telescope (on CGRO) 
 EJASA:     Electronic Journal of the Astronomical Society of the Atlantic 
 ELV:       Expendable Launch Vehicle 
 EMU:       Extravehicular Mobility Unit 
 EOS:       Earth Observing System 
 ER:        Eastern Range (was ETR) 
 ERS:       Earth Resources Satellite (as in ERS-1) 
 ESA:       European Space Agency 
 ESIS:      European Space Information System 
 ESO:       European Southern Observatory 
 ESOC:      European Space Operations Centre 
 ESTEC:     European Space Research & Technology Centre 
 ET:        (Shuttle) External Tank 
 ETLA:      Extended Three Letter Acronym 
 ETR:       Eastern Test Range 
 EUV:       Extreme UltraViolet 
 EUVE:      Extreme UltraViolet Explorer 
 EVA:       ExtraVehicular Activity 
 FAQ:       Frequently Asked Questions 
 FAST:      Fast Auroral SnapshoT explorer 
 FFT:       Fast Fourier Transform 
 FGS:       Fine Guidance Sensors (on HST) 
 FHST:      Fixed Head Star Trackers (on HST) 
 FIR:       Far InfraRed 
 FITS:      Flexible Image Transport System 
 FOC:       Faint Object Camera (on HST) 
 FOS:       Faint Object Spectrograph (on HST) 
 FOV:       Field Of View 
 FRC:       Flight Research Center (old name for DFRC) 
 FRR:       Flight-Readiness Review 
 FTETTM:    From The Earth To The Moon 
 FTL:       Faster Than Light 
 FTP:       File Transfer Protocol 
 FTS:       Flight Telerobotic Servicer 
 FUSE:      Far Ultraviolet Spectroscopic Explorer 
 FWHM:      Full Width at Half Maximum 
 FYI:       For Your Information 
 G:         Gravity 
 GAS:       Get-Away Special 
 GBT:       Green Bank Telescope 
 GCVS:      General Catalog of Variable Stars 
 GEM:       Giotto Extended Mission 
 GEM:       Galileo Europa Mission 
 GEO:       Geosynchronous Earth Orbit 
 GDS:       Great Dark Spot 
 GHRS:      Goddard High Resolution Spectrograph (on HST) 
 GIF:       Graphics Interchange Format 
 GLOMR:     Global Low-Orbiting Message Relay 
 GLOW:      Gross Lift-Off Weight 
 GMC:       Giant Molecular Cloud 
 GMRT:      Giant Meter-wave Radio Telescope 
 GMT:       Greenwich Mean Time (also called UT) 
 GOES:      Geostationary Orbiting Environmental Satellite 
 GOX:       Gaseous OXygen 
 GPC:       General Purpose Computer 
 GPS:       Global Positioning System 
 GR:        General Relativity 
 GRB:       Gamma Ray Burster 
 GRC:       Glenn Research Center (NASA) 
 GRO:       Gamma Ray Observatory (now CGRO) 
 GRS:       Gamma Ray Spectrometer (on Mars Observer) 
 GRS:       Great Red Spot 
 GSC:       Guide Star Catalog (for HST) 
 GSFC:      Goddard Space Flight Center (NASA) 
 GTO:       Geostationary Transfer Orbit 
 GVI:       Global Village Idiot 
 HAO:       High Altitude Observatory 
 HD:        Henry Draper catalog entry 
 HEAO:      High Energy Astronomical Observatory 
 HeRA:      Hermes Robotic Arm 
 HF:        High Frequency 
 HGA:       High Gain Antenna 
 HLC:       Heavy Lift Capability 
 HLV:       Heavy Lift Vehicle 
 HMC:       Halley Multicolor Camera (on Giotto) 
 HOTOL:     HOrizontal TakeOff and Landing (a proposed SSTO craft) 
 HR:        Hertzsprung-Russell (diagram) 
 HRMS:      High Resolution Microwave Survey 
 HRI:       High Resolution Imager (on ROSAT) 
 HSP:       High Speed Photometer (on HST) 
 HST:       Hubble Space Telescope 
 HTH:       Hope This Helps 
 HTHL:      Horizontal Takeoff Horizontal Landing 
 HTVL:      Horizontal Takeoff Vertical Landing 
 HUT:       Hopkins Ultraviolet Telescope (ASTRO package) 
 HV:        High Voltage 
 IAPPP:     International Amateur/Professional Photoelectric Photometry 
 IAU:       International Astronomical Union 
 IAUC:      IAU Circular 
 ICE:       International Cometary Explorer 
 IDA:       International Dark-sky Association 
 IDL:       Interactive Data Language 
 IGM:       InterGalactic Medium 
 IGY:       International Geophysical Year 
 IIRC:      If I Recall Correctly 
 IMHO:      In My Humble Opinion 
 IMO:       International Meteor Organization 
 INTEGRAL:  INTErnational Gamma-Ray Astrophysics Laboratory 
 IOTA:      Infrared-Optical Telescope Array 
 IOTA:      International Occultation Timing Association 
 IPS:       Inertial Pointing System 
 IR:        InfraRed 
 IRAF:      Image Reduction and Analysis Facility 
 IRAS:      InfraRed Astronomical Satellite 
 IRFNA:     Inhibited Red Fuming Nitric Acid 
 ISAS:      Institute of Space and Astronautical Science (Japan) 
 ISM:       InterStellar Medium 
 ISO:       Infrared Space Observatory 
 ISO:       International Standards Organization 
 ISPM:      International Solar Polar Mission (now Ulysses) 
 ISPP:      In-Situ Propellant Production 
 ISS:       International Space Station 
 ISY:       International Space Year 
 IUE:       International Ultraviolet Explorer 
 IUS:       Inertial Upper Stage 
 JEM:       Japanese Experiment Module (for SSF) 
 JGR:       Journal of Geophysical Research 
 JILA:      Joint Institute for Laboratory Astrophysics 
 JPL:       Jet Propulsion Laboratory 
 JSC:       Johnson Space Center (NASA) 
 KAO:       Kuiper Airborne Observatory 
 KPNO:      Kitt Peak National Observatory 
 KSC:       Kennedy Space Center (NASA) 
 KTB:       Cretaceous-Tertiary Boundary (from German) 
 L:         Lagrange (as in Lagrange points L1 through L5) 
 LANL:      Los Alamos National Laboratory 
 LaRC:      Langley Research Center (NASA) 
 LASER:     Light Amplification by Stimulated Emission of Radiation 
 LDEF:      Long Duration Exposure Facility 
 LEM:       Lunar Excursion Module (a.k.a. LM) (Apollo spacecraft) 
 LEO:       Low Earth Orbit 
 LeRC:      Lewis Research Center (NASA; now GRC) 
 LEST:      Large Earth-based Solar Telescope 
 LFSA:      List of Frequently Seen Acronyms (!) 
 LGA:       Low Gain Antenna 
 LGM:       Little Green Men 
 LH:        Liquid Hydrogen (also LH2 or LHX) 
 LITVC:     Liquid Injection Thrust Vector Control 
 LLNL:      Lawrence-Livermore National Laboratory 
 LM:        Lunar Module (a.k.a. LEM) (Apollo spacecraft) 
 LMC:       Large Magellanic Cloud 
 LN2:       Liquid N2 (Nitrogen) 
 LOX:       Liquid OXygen 
 LPO:       La Palma Observatory 
 LPV:       Long Period Variable 
 LRB:       Liquid Rocket Booster 
 LSR:       Local Standard of Rest 
 LTP:       Lunar Transient Phenomenon 
 M:         Messier (as in M31, M13, M57, etcetera) 
 MACRO:     Monopoles, Astrophysics, and Cosmic Ray Observatory 
 MB:        Manned Base 
 MCC:       Mission Control Center 
 MCD:       Minimum Cost Design 
 MCO:       Mars Climate Orbiter 
 MECO:      Main Engine CutOff 
 MERIS:     Medium Resolution Imaging Spectrometer 
 MGS:       Mars Global Surveyor 
 MHD:       MagnetoHydroDynamic 
 MLI:       Multi-Layer Insulation 
 MMH:       MonoMethyl Hydrazine 
 MMT:       Multiple Mirror Telescope 
 MMU:       Manned Maneuvering Unit 
 MNRAS:     Monthly Notices of the Royal Astronomical Society 
 MO:        Mars Observer 
 MOC:       Mars Observer Camera (on MO and MGS) 
  
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 --- SoupGate-Win32 v1.05 
  * Origin: you cannot sedate... all the things you hate (1:229/2)