| Acronym | Meaning |
 | TOPS | Toward Other Planetary Systems |
| HF | High Frequency |
| IML | International Microgravity Lab |
| STARCAL | Star Calibration |
| ERS | Earth Resources Satellite |
| QSO | Quasi-Stellar Object |
| CRAF | Comet Rendezvous/Asteroid Flyby |
| OSC | Orbital Sciences Corporation |
| IDA | International Dark-sky Association |
| GST | Greenwich Sidereal Time |
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