| Acronym | Meaning |
 | MEV | Mars Excursion Vehicle |
| HR | Hertzsprung-Russell |
| MDSSC | McDonnell Douglas Space Systems Corp |
| PMS | Pre-Main Sequence |
| MACS | Modular Attitude Control System |
| NASA | National Aeronautics And Space Administration |
| FFCC | Free-Flyer Control Centre |
| MACHO | MAssive Compact Halo Object |
| IPAC | Infrared Processing & Analysis Center |
| HERA | Hermes Robotic Arm |
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