| Acronym | Meaning |
 | LARC | Langley Research Center |
| DOR | Differenced One-way Range |
| SAMPEX | Solar Anomalous And Magnetospheric Particle EXplorer |
| SPARTAN | Shuttle Pointed Autonomous Research Tool For Astronomy |
| NRO | National Reconnaissance Office |
| EMU | Extravehicular Mobility Unit |
| FRR | Flight-Readiness Review |
| HTHL | Horizontal Takeoff Horizontal Landing |
| HDM | Hot Dark Matter |
| CHARA | Center For High Angular Resolution Astronomy |
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