| Acronym | Meaning |
 | ESO | European Southern Observatory |
| HR | Hertzsprung-Russell |
| GSO | GeoSynchronous Earth Orbit |
| OCTS | Ocean Color And Temperature Scanner |
| CASSINI | Saturn Orbiter And Titan Probe |
| LY | Light Year (usu. Ly) |
| IOA | Institute Of Astronomy (Cambridge) |
| EVA | Extravehicular Activity |
| LST | Local Sidereal Time |
| HUT | Hopkins Ultraviolet Telescope |
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