| Acronym | Meaning |
| UTC | Coordinated Universal Time |
| EDRS | European Data Relay Satellite |
| PPF | Columbus Polar Platform |
| AXAF | Advanced X-ray Astrophysics Facility |
| HCMM | Heat Capacity Mapping Mission |
| NTR | Nuclear Thermal Rocket(ry) |
| ERS | Environmental Research Satellite |
| ESPC | European Space Power Conference |
| TOS | Transfer Orbit Stage |
| MTC | Man Tended Capability |