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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)