| Acronym | Meaning |
| NACA | National Advisory Committee On Aeronautics |
| ESRIN | European Space Research Institute |
| USML | United States Microgravity Laboratory |
| RAS | Royal Astronomical Society |
| QSO | Quasi-Stellar Object |
| ALS | Advanced Launch System |
| MRSR | Mars Rover And Sample Return |
| ATM | Apollo Telescope Mount (on Skylab) |
| DM | Dark Matter |
| CASSINI | Saturn Orbiter And Titan Probe |