G
| Acronym | Meaning |
| GB | Gigabytes |
| GCI | Geocentric Celestial Inertial Coordinate System |
| GEM | Graphite Epoxy Motor |
| GenSAA | Generic Spacecraft Analysis Assistant |
| GEO | geocorona |
| GHz | gigahertz |
| GMT | Greenwich Mean Time |
| GRI | Ground Reference Image |
| GSE | Geocentric Solar Ecliptic Coordinate System Ground Support Equipment |
| GSEOS | Ground Support Equipment Operating System |
| GSFC | Goddard Space Flight Center |
| GSM | Geocentric Solar Magnetospheric Coordinate System |
| GTDS | Goddard Trajectory Determination System |
H
| Acronym | Meaning |
| H&S | Health and Safety |
| HENA | High-Energy Neutral Atom High-Energy Neutral Atom Imager |
| HK | housekeeping |
| HVAC | Heating, Ventilation, and Air Conditioning |
| Hz | Hertz |
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