| Acronym | Meaning |
 | CXBR | Cosmic X-ray Background Radiation |
| EMU | Extravehicular Mobility Unit |
| SSME | Space Shuttle Main Engine |
| USAF | United States Air Force |
| SEP | Societe Europeenne De Propulsion |
| MPC | Minor Planets Circular |
| SAO | Smithsonian Astrophysical Observatory |
| ISPM | International Solar Polar Mission |
| HIRIS | High Resolution Imaging Spectrometer |
| RCS | Reaction Control System / Revision Control System |
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