| Acronym | Meaning |
| GSO | GeoSynchronous Earth Orbit |
| GPPF | Gravitational Plant Physiology Facility |
| ISU | International Space University |
| PEM | Particle Environment Monitor |
| SOFIA | Stratospheric Observatory For Infrared Astronomy |
| SSRV | Solar-Sail Race Vehicle |
| RA | Right Ascension |
| AMSR | Advanced Microwave Sounding Radiometer |
| APU | Auxiliary Power Unit |
| ACE | Advanced Composition Explorer |