| Acronym | Meaning |
 | PTC | Passive Thermal Control |
| E | Elliptical (for Galaxies) |
| ALEXIS | Array Of Low Energy X-ray Imaging Sensors |
| VAS | VISSR Atmospheric Sounder |
| ZCG | Zeolite Crystal Growth |
| MMS | Multi-mission Modular Spacecraft |
| ACRV | Assured Crew Return Vehicle |
| FHST | Fixed Head Star Trackers |
| CDDT | Countdown Demonstration Test |
| MIMR | Multifrequency Imaging Microwave Radiometer |
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