| Abbreviation | Definition |
|---|---|
| SDMS | Spatial Data Management System |
| SDS | Star Diagnosis System |
| SE | Solar Empire |
| SEC | Sun-Earth Connection |
| SEM | Sun, Earth, Moon |
| SEP | Solar Energetic Particle |
| SEPF | Solar Energetic Proton Fluxes |
| SETA | Search For Extra Terrestrial Artifacts |
| SETG | Search for Extra-Terrestrial Genomes |
| SETI | Search For Extra Terrestial Intelligence |
| SF | Science Fiction |
| SF | Surface Features |
| SFAC | Santa Fe Astronomy Club |
| SFC | Space Forecast Center |
| SFM | Super Full Moon |
| SFN | Star Formation Newsletter |
| SFR | Star Formation Rate |
| SFS | Smallest Feature Size |
| SG | Shattered Galaxy |
| SG | Star Graph |