| Acronym | Meaning |
 | TIG | Time Of (until) Ignition |
| CELSS | Controlled Ecological Life Support System |
| GEODSS | Ground-based Electro-optical Deep-space Surveillance System |
| SAR | Search And Rescue / Synthetic Aperture Radar |
| AC | Atlas Centaur |
| FRSI | Flexible Reusable Surface Insulation |
| LRB | Liquid Rocket Booster |
| HRDI | High Resolution Doppler Imager |
| DM | Dark Matter |
| NS | Neutron Star |
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