| Acronym | Meaning |
| VLBI | Very Long Baseline Interferometry |
| TOS | Transfer Orbit Stage |
| FWHM | Full Width At Half Maximum |
| CDA | Command And Data Acquisition |
| OARE | Orbital Acceleration Research Experiment |
| DSN | Deep Space Network |
| EPD | Energetic Particles Detector |
| GOMR | Global Ozone Monitoring Radiometer |
| AGU | American Geophysical Union |
| MACHO | MAssive Compact Halo Object |