| Acronym | Meaning |
 | REM | Rat Enclosure Module |
| ISO | Imaging Spectrometic Observatory |
| PLBD | Payload Bay Doors |
| OMS | Orbital Maneuvering System |
| ARRL | American Radio Relay League |
| FWHM | Full Width At Half Maximum |
| UKST | United Kingdom Schmidt Telescope |
| ADS | Astrophysical Data System (at Havard-Smithsonian CfA) |
| IUS | Inertial Upper Stage |
| HD | Henry Draper Catalog Entry |
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