| Acronym | Meaning |
 | HOTOL | HOrizontal TakeOff And Landing |
| AGB | Asymptotic Giant Branch |
| SIXA | Silicon X-ray Array |
| SEP | Societe Europeenne De Propulsion |
| STSCI | Space Telescope Science Institute |
| IML | International Microgravity Lab |
| JGR | Journal Of Geophysical Research |
| SLAR | Side-Looking Airborne Radar |
| PV | Photovoltaic |
| MSFC | Marshall Space Flight Center |
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