| Acronym | Meaning |
 | NASP | National AeroSpace Plane |
| VICAR | Graphics Format Used By JPL |
| XMM | X-ray Multi Mirror |
| OMB | Office Of Management And Budget |
| HD | Henry Draper Catalog Entry |
| ATDRS | Advanced Tracking And Data Relay Satellite |
| UVS | Ultraviolet Spectrometer |
| AGN | Active Galactic Nucleus |
| HRSC | High Resolution Stereo Camera |
| PDRS | Payload Deployment And Retrieval System |
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