Q
- QBO – (astrophysics terminology) Quasi-Biennial Oscillation, a type of season variation in the Earth's atmosphere
- QE – (instrumentation) Quantum Efficiency, the sensitivity of CCDs
- QPO – (astrophysics terminology) Quasi-Periodic Oscillation
- QSO – (celestial object) Quasi-Stellar Object
- Quasar – (celestial object) QUASi-stellAR radio source
Read more about this topic: List Of Astronomy Acronyms