• Q-branch
• quadrant
• quadratic effect
• quadratic mean error
• quadratic Stark effect
• quadratic Zeeman effect
• quadrature
• quadruple moment
• quadruple star
• quadrupole
• quadrupole multiplet
• quadrupole radiation
• quadrupole splitting
• qualitative chemical analysis
• qualitative spectral analysis
• quality control
• quality of images
• quanta
• quantitative chemical analysis
• quantitative classification methods
• quantitative spectral analysis
• quantitative spectral classification
• quantitative work
• quantity
• quantity measurable
• quantity of illumination
• quantization
• quantization rule
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• quantometer
• quantum
• quantum defect
• quantum efficiency
• quantum electronics
• quantum emission
• quantum jump
• quantum luminosity curve
• quantum mechanics
• quantum noise
• quantum number
• quantum number I
• quantum of action
• quantum state
• quantum theory
• quantum transition
• quantum yield
• quarter
• quarter-wavelength plate
• quarter wave plate
• quarter-wave plate
• quartet
• quartet multiplet
• quartet state
• quartz
• quartz clock
• quartz-crystal clock
• quartz mirror
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• quartz plate
• quartz prism
• quartz spectrograph
• quasag
• quasar
• quasar galaxy
• quasar model
• quasar radio source
• quasi-eruptive prominence
• quasi-molecule
• quasi-particle
• quasi-stellar
• quasi-stellar galaxy
• quasi-stellar object
• quasi-stellar source
• quaternary combination band
• quick drying
• quick look data
• quiescent prominence
• quiet component
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