| Acronym | Meaning |
 | JSC | Johnson Space Center |
| TDRSS | Tracking And Data Relay Satellite System |
| IGM | InterGalactic Medium |
| OTA | Optical Telescope Assembly |
| CG | Center Of Gravity |
| CHARA | Center For High Angular Resolution Astronomy |
| SLAP | Space Link Access Protocol |
| ACRIM | ACR Irradiance Monitor |
| HALOE | Halogen Occultation Experiment |
| GPS | Global Positioning System |
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