| Acronym | Meaning |
 | MVI | Microgravity Vestibular Investigation |
| S | Spiral (for Galaxies) |
| ETM | Enhanced Thematic Mapper |
| HDM | Hot Dark Matter |
| UIT | Ultraviolet Imaging Telescope |
| LM | Lunar Module |
| ACR | Active Cavity Radiometer |
| PVO | Pioneer Venus Orbiter / Protivo-Vosdushniya Oborona |
| WMO | World Meterological Organisation |
| SWAS | Submillimeter Wave Astronomy Satellite |
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