| Acronym | Meaning |
 | IGM | InterGalactic Medium |
| CDM | Cold Dark Matter |
| GLOMR | Global Low-Orbiting Message Relay |
| SHARE | Space Station Heat Pipe Advanced Radiator Element |
| PDRS | Payload Deployment And Retrieval System |
| KTB | Cretaceous-Tertiary Boundary |
| GPPF | Gravitational Plant Physiology Facility |
| HRPT | High Resolution Picture Transmission |
| SPH | Smoothed-Particle Hydrodynamics |
| HOTOL | HOrizontal TakeOff And Landing |
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