stel - supe
- stellar
- stellar abundance
- stellar atmospheres
- stellar dynamics
- stellar envelopes
- stellar evolution
- stellar interferometers
- stellar interferometry
- stellar interiors
- stellar motions
- stellar oscillations
- stellar populations
- stellar rings
- stellar seismology
- stellar structure
- stellar winds
- stimulated emission
- stimulated radiation
- Stokes parameters
- stratopause
- stratosphere
- streak photography
- streamers
- strings
- stroboscopes
- Stromgren photometry
- Stromgren sphere
- strong interactions
- strontium stars
- structure
- su ursae majoris stars
- subdwarf stars
- subgiant stars
- subluminous stars
- submillimeter astronomy
- submillimeter waves
- subreflectors
- summer solstice
