| Acronym | Meaning |
 | VTVL | Vertical Takeoff Vertical Landing |
| SOB | Strap-On Booster |
| ALAE | Atmospheric Lyman-Alpha Emissions |
| ZHR | Zenith Hourly Rate |
| NRL | Naval Research Laboratory |
| NRSC | National Remote Sensing Centre |
| GEM | Graphite Epoxy Motor |
| AW&ST | Aviation Week And Space Technology |
| GDS | Great Dark Spot |
| UOSAT | University Of Surrey Satellite |
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