| Acronym | Meaning |
 | AIAA | American Institute Of Aeronautics And Astronautics |
| NERVA | Nuclear Engine For Rocket Vehicle Application |
| IPS | Inertial Pointing System |
| ASA | Astronomical Society Of The Atlantic |
| NRSC | National Remote Sensing Centre |
| DIRBE | Diffuse Infrared Background Experiment |
| LY | Light Year (usu. Ly) |
| LTP | Lunar Transient Phenomenon |
| ETM | Enhanced Thematic Mapper |
| GMS | Geostationary Meterological Satellite |
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