Alphabetical Listing of Astronomy Acronyms
- GOMOS — Global Ozone Monitoring By Occultation of Stars
- GOMR — Global Ozone Monitoring Radiometer
- GOSAMR — Gelation of Soils: Applied Microgravity Research
- GOX — Gaseous OXygen
- GPC — General Purpose Computer
- GPPF — Gravitational Plant Physiology Facility
- GPS — Global Positioning System
- GR — General Relativity
- GRO — Gamma Ray Observatory
- GRS — Gamma Ray Spectrometer
- GRS — Great Red Spot
- GRTLS — Glide RTLS
- GRU — Glavnoye Razvedivatel’noye Upravileniye
- GSC — Guide Star Catalog
- GSFC — Goddard Space Flight Center
- GSO — GeoSynchronous Earth Orbit
- GST — Greenwich Sidereal Time
- GTO — Geostationary Transfer Orbit
- GUGK — Glavnoye Upravileniye Geodesii I Kartografii
- HAINS — High Accuracy Inertial Navigation System
- HALOE — Halogen Occultation Experiment
- HAO — High Altitude Observatory
- HB — Horizontal Branch
- HCI — Highes Communications
- HCMM — Heat Capacity Mapping Mission
- HD — Henry Draper Catalog Entry
- HDE — Henry Draper Extension
- HDM — Hot Dark Matter
- HEAO — High Energy Astronomical Observatory
- HERA — Hermes Robotic Arm
- HF — High Frequency
- HGA — High Gain Antenna
- HH — Hitchhiker
- HIRDLS — High Resolution Dynamics Limb Sounder
- HIRIS — High Resolution Imaging Spectrometer
- HIRS — High Resolution Infrared Radiation Sounder
- HJD — Helicentric Julian Date
- HLC — Heavy Lift Capability
- HLV — Heavy Lift Vehicle
- HMC — Halley Multicolor Camera
- HOTOL — HOrizontal TakeOff And Landing
- HPFTP — High Pressure Fuel Turbopump
- HPOTP — High Pressure Oxidizer Turbopump
- HR — Hertzsprung-Russell
- HRDI — High Resolution Doppler Imager
- HRI — High Resolution Imager
- HRMS — High Resolution Microwave Survey
- HRPT — High Resolution Picture Transmission
- HRSC — High Resolution Stereo Camera
- HRSI — High-temperature Reusable Surface Insulation
- HRSR — High-Resolution Scanning Radiometer
- HSP — High Speed Photometer
- HST — Hubble Space Telescope
- HTHL — Horizontal Takeoff Horizontal Landing
- HTVL — Horizontal Takeoff Vertical Landing
- HUT — Hopkins Ultraviolet Telescope
- HV — High Voltage
- IAPPP — International Amateur/Professional Photoelectric Photometry
- IAU — International Astronomical Union
- IAUC — IAU Circular
- IBSS — Infrared Background Signature Survey
- IC — Index Catalog
- ICE — International Cometary Explorer
- IDA — International Dark-sky Association
- IDL — Interactive Data Language
- IFEA — Integrated Furnace Experiment Assembly
- IGBP — International Geosphere/Biosphere Programme
- IGM — InterGalactic Medium
- IGY — International Geophysical Year
- IKI — Institut Kosmischeskikh Issledovaniya
- IML — International Microgravity Lab
- IMO — International Meteor Organization
- IMU — Inertial Measurement Unit
- INCO — Integrated Communications Officer
- INMARSAT — International Maritime Satellite
- INTELSAT — International Telecommunications Satellite
- IOA — Institute of Astronomy (Cambridge)
- IOBM — In Ocean By Mistake
- IOC — In-Orbit Checkout And Calibration
- IOTA — Infrared-Optical Telescope Array
- IOTA — International Occultation Timing Association
- IPAC — Infrared Processing & Analysis Center
- IPMP — Investigations Into Polymer Membrane Processing
- IPS — Inertial Pointing System
- IR — InfraRed
- IRAF — Image Reduction And Analysis Facility
- IRAS — InfraRed Astronomical Satellite
- IRFNA — Inhibited Red Fuming Nitric Acid
- ISAMS — Improved Stratospheric And Mesospheric Sounder
- ISAS — Institute of Space AND Astronautical Science
- ISEP — Isolated/Stabilized Exercise Platform
- ISM — InterStellar Medium
- ISO — Imaging Spectrometic Observatory
- ISO — Infrared Space Observatory
- ISO — International Standards Organization
- ISPM — International Solar Polar Mission
- ISRO — Indian Space Research Organisation
- ISTS — Institute For Space And Terrestrial Science
- ISU — International Space University
- ISY — International Space Year