| Acronym | Meaning |
 | AFWTR | USAF's WTR |
| APT | Automatic Photoelectric Telescope |
| OPF | Orbiter Processing Facility |
| E | Elliptical (for Galaxies) |
| IRFNA | Inhibited Red Fuming Nitric Acid |
| DARPA | Defense Advanced Research Projects Agency |
| CRAF | Comet Rendezvous/Asteroid Flyby |
| DIRBE | Diffuse Infrared Background Experiment |
| DMR | Differential Microwave Radiometer |
| ERBE | Earth Radiation Budget Experiment |
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