| Acronym | Meaning |
 | LEM | Lunar Excursion Module |
| HH | Hitchhiker |
| VOIR | Venus Orbiting Imaging Radar |
| GMT | Greenwich Mean Time |
| SLS | Space(lab) Life Sciences |
| HD | Henry Draper Catalog Entry |
| HRPT | High Resolution Picture Transmission |
| IGBP | International Geosphere/Biosphere Programme |
| JD | Julian Date; Julian Day (Number) |
| NTT | New Technology Telescope |
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