| Acronym | Meaning |
 | ALEXIS | Array Of Low Energy X-ray Imaging Sensors |
| SMEX | Small EXplorers |
| UFO | Unidentified Flying Object |
| RMS | Remote Manipulator System |
| CMCC | Central Mission Control Centre |
| IFEA | Integrated Furnace Experiment Assembly |
| CATS | Cheap Access To Space |
| LGM | Little Green Men |
| GTO | Geostationary Transfer Orbit |
| STSDAS | Space Telescope Science Data Analysis System |
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