| Acronym | Meaning |
 | ESO | European Southern Observatory |
| SMC | Small Magellanic Cloud |
| VEEGA | Venus-Earth-Earth Gravity Assist |
| TSM | Tail Service Mast |
| MRIR | Medium Resolution Infrared Radiometer |
| VRM | Venus Radar Mapper |
| NSA | National Security Agency |
| EDO | Extended Duration Orbiter |
| UDMH | Unsymmetrical DiMethyl Hydrazine |
| EROS | Earth Resources Observations System |
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