| Acronym | Meaning |
 | E | Elliptical (for Galaxies) |
| GSO | GeoSynchronous Earth Orbit |
| GRO | Gamma Ray Observatory |
| LARC | Langley Research Center |
| PVO | Pioneer Venus Orbiter / Protivo-Vosdushniya Oborona |
| MRSR | Mars Rover And Sample Return |
| ISZ | Iskusstvenniy Sputnik Zemli |
| MOMS | Modular Optoelectronic Multispectral/Stereo Scanner |
| CV | Cataclysmic Variable |
| CRRES | Combined Release/Radiation Effects Satellite |
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