| Acronym | Meaning |
 | UBM | Unpressurized Berthing Mechanism |
| MRSRM | Mars Rover And Sample Return Mission |
| TM | Thematic Mapper |
| SR | Special Relativity |
| NRO | National Reconnaissance Office |
| INMARSAT | International Maritime Satellite |
| LEO | Low Earth Orbit |
| PTC | Passive Thermal Control |
| UTC | Coordinated Universal Time |
| ATM | Apollo Telescope Mount (on Skylab) |
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