| Acronym | Meaning |
 | HST | Hubble Space Telescope |
| DSN | Deep Space Network |
| ENSO | El Nino/Southern Oscillation |
| NSO | National Solar Observatory |
| ADS | Aitken Double Star Catalog |
| NRO | National Reconnaissance Office |
| MMS | Multi-mission Modular Spacecraft |
| AE | Arianespace SA |
| WD | White Dwarf |
| CASSINI | Saturn Orbiter And Titan Probe |
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