| Acronym | Meaning |
 | MMS | Multi-mission Modular Spacecraft |
| OMDP | Orbiter Maintenance Down Period |
| HV | High Voltage |
| SPDM | Special Purpose Dextrous Manipulator |
| SIXA | Silicon X-ray Array |
| HTVL | Horizontal Takeoff Vertical Landing |
| ESTEC | European Space Research And Technology Centre |
| IAU | International Astronomical Union |
| ROUS | Rodents Of Unusual Size |
| SEPAC | Space Experiments With Particle Accelerators |
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