| Acronym | Meaning |
| CITA | Canadian Institute For Theoretical Astrophysics |
| AFPRO | Air Force Plan Representative Office |
| MOC | Mars Observer Camera |
| NTR | Nuclear Thermal Rocket(ry) |
| EDRS | European Data Relay Satellite |
| APL | Applied Physics Laboratory (at Johns Hopkins) |
| PDE | Particle Dispersion Experiment |
| ACTS | Advanced Communications Technology Satellite |
| CEA | Center For EUV Astrophysics |
| MIMR | Multifrequency Imaging Microwave Radiometer |