| Acronym | Meaning |
 | PETS | Performance Evaluation And Test System |
| MASI | Middle Atmosphere Science Initiative |
| MAPS | Millions Of Actions Per Second |
| GSFC | Goddard Space Flight Center |
| BFS | Business And Financial Services |
| NEXUS | Navaid-based Upper- Air Sounding System |
| UUCP | UNIX-to-UNIX Copy |
| ATM | Asynchronous Transfer Mode |
| EM | Electromagnetic Conductivity |
| TIME-GCM | Thermosphere-ionosphere-mesosphere-electrodynamic General Circulation Model |
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