| Acronym | Meaning |
 | SSCE | Solid Surface Combustion Experiment |
| OTHB | Over The Horizon Backscatter |
| TOPS | Toward Other Planetary Systems |
| UIT | Ultraviolet Imaging Telescope |
| MACS | Modular Attitude Control System |
| SNU | Solar Neutrino Units |
| VLBI | Very Long Baseline Interferometry |
| JD | Julian Date; Julian Day (Number) |
| PMC | Permanently Manned Capability |
| BFCS | Backup Flight Control System |
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