| Acronym | Meaning |
 | APU | Auxiliary Power Unit |
| GEM | Giotto Extended Mission |
| VLA | Very Large Array |
| FRED | Space Station Freedom |
| SAT | Synthetic Aperture Telescope |
| FAP | Freedom Attached Payloads |
| EOSP | Earth Observing Scanning Polarimeter |
| TDRSS | Tracking And Data Relay Satellite System |
| EGRET | Energetic Gamma Ray Experiment Telescope |
| SLAP | Space Link Access Protocol |
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