| Acronym | Meaning |
 | YSO | Young Stellar Object |
| SPDM | Special Purpose Dextrous Manipulator |
| SNU | Solar Neutrino Units |
| ATAL | Alternate Transoceanic Abort Landing |
| NACA | National Advisory Committee On Aeronautics |
| GRO | Gamma Ray Observatory |
| FTS | Flight Telerobotic Servicer |
| SHARE | Space Station Heat Pipe Advanced Radiator Element |
| GEO | Geosynchronous Earth Orbit |
| OTV | Orbital Transfer Vehicle |
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