| Acronym | Meaning |
 | SEI | Space Exploration Initiative |
| HRMS | High Resolution Microwave Survey |
| NBS | National Bureau Of Standards |
| E | Elliptical (for Galaxies) |
| MEV | Mars Excursion Vehicle |
| LIS | Lightning Imaging Sensor |
| CCRS | Canada Centre For Remote Sensing |
| GBT | Green Bank Telescope |
| OMDP | Orbiter Maintenance Down Period |
| HOTOL | HOrizontal TakeOff And Landing |
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