- SDAM
- semiconductors
- serotonin
- SETI Institute
- SLS
- SOFIA
- SOHO
- Solar Dynamics Observatory
- solar flare
- Space Telescope Science Institute
- SpaceX
- species
- SPring-8
- stellarator
- synapse
- terahertz
- TESS
- tetrapods
- The Lancet
- The Lancet Neurology
- Thwaites Glacier
- TNOs
- Triassic
- UCLA
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- University of York
- Uranus
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- Venus
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- Very Large Telescope
- VIRGO
- virus
- WFIRST
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- XARM
- Yale University
- Yonsei University