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1701 "S"

• Sacramento peak observatory
• Sa galaxy
• sag car
• SAGE neutrino detector
• sagitta
• sagittal
• sagittal focus
• Saha equation
• Saha's equation
• Saha's ionization formula
• sampling theorem
• sandwich construction
• sandwich mirror
• SAO star catalog
• Saros
• Sa Sb galaxy
• Sa SB spiral
• Sa spiral
• satellite
• satellite astronomy
• satellite-borne
• satellite-borne instruments
• satellite branches
• satellite camera
• satellite drag
• satellite in long-lived orbit
• satellite line
• satellite observations
• satellite observatory
• satellite-range measurement
• satellite's motion
• satellite's orbit
• satellite spectroscopy
• satellite's period
• satellite's spin
• satellite system
• satellite track
• satellite tracking
• satellite trail
• satellite vehicle
• saturated
• saturated color
• saturation
• saturation effect
• saturation function
• S-branch
• SB Sb spiral
• Sb Sc galaxy
• Sb Sc spiral
• scale
• scale correction
• scale factor
• scale of micrometer
• scale of the Galaxy
• scale of the universe
• scale Value
• scale Value of telescope
• scan
• scandium
• scanner
• scanning
• scanning device
• scanning drive
• scanning element
• scanning motion
• scanning rate
• scan strip scan
• scatter
• scatter diagram
• scattered beam
• scattered electrons
• scattered light
• scattered radiation
• scattered starlight
• scattered star light
• scattered sunlight
• scattering
• scattering atmosphere
• scattering coefficient
• scattering cross-section
• scattering effect
• scattering efficiency
• scattering electron
• scattering function
• scattering law
• scattering matrix
• scattering medium
• scattering power
• scattering theory
• scheme
• scheme of band heads
• Schiefspiegler telescope
• Schmidt
• Schmidt aplanatic sphere camera
• Schmidt camera
• Schmidt camera optics
• Schmidt-Cassegrain telescope
• Schmidt plate
• Schmidt's tube
• Schmidt system
• Schmidt telescope
• Schottky effect
• Schrodinger's equation
• Schuman-Runge bands
• Schuster-Schwarzschild method
• Schuster-Schwarzschild model
• Schuster's n
• Schwinger radiation
• science
• scientific probe
• scintillate
• scintillation
• scintillation counter
• scintillation detector
• scintillation effects
• scintillation fluctuations
• scintillation in direction
• scintillation in intensity
• scintillation measures
• scintillation noise
• scintillation of radio stars
• scintillation phenomenon
• scintillation spectrum
• scissoring vibration
• sclera
• sclerotic
• SCNA telluric absorption
• S-component
• scotch mounting
• scotopic luminosity curve
• scotopic vision
• scratch
• screen
• screen brightness
• screen brilliance
• screen efficiency
• screen illumination
• screen image
• screening
• screening constant
• screening effect
• screen intensity
• screw
• screw micrometer
• Sc Seyfert galaxy
• Sc well-developed spiral
• sea
• sealing wax
• search
• season
• seasonal
• seasonal anomaly
• seasonal changes
• seasonal variation
• seat
• second
• second art collision
• second-art transition
• secondary
• secondary color
• secondary cosmic radiation
• secondary cosmic ray
• secondary cosmic rays
• secondary eclipse
• secondary electron
• secondary emission
• secondary image
• secondary ionization
• secondary minimum
• secondary mirror
• secondary mirror cage
• secondary processes
• secondary prominence
• secondary ring
• secondary source
• secondary spectrum
• secondary star
• second contact
• second kind collision
• second of arc
• second of time
• second order Stark effect
• second subordinate series
• second subsidiary series
• section
• sector
• sector acceleration
• sector opening
• secular
• secular aberration
• secular acceleration
• secular contraction
• secular determinant
• secular parallax
• secular perturbation
• secular precession
• secular secular in declination
• secular secular in right ascension
• secular term
• seeing
• seeing bad
• seeing compensator
• seeing conditions
• seeing disk
• seeing-disk diameter
• seeing-disk profile
• seeing distortions
• seeing disturbance
• seeing effects
• seeing estimate
• seeing fair
• seeing feature
• seeing good
• seeing image
• seeing measures
• seeing monitor
• seeing observations
• seeing phenomena
• seeing phenomenon
• seeing poor
• seeing profile
• seeing shifts
• seeing study
• seeing test
• seeing very bad
• segmented mirror
• Seidel aberration
• seismic detector
• selected
• selected area
• selected equinox
• selection
• selection effect
• selection rules
• selective
• selective absorber
• selective absorption
• selective diffuser
• selective effect
• selective radiator
• selective receiver
• selective sensitivity
• selectivity
• selenium cell
• selenocentric
• selenocentric orbit
• selenodesy
• selenographer
• selenographic
• selenographical
• selenographic coordinates
• selenographist
• selenography
• selenological
• selenology
• self-absorption
• self-adjusting
• self-admittance
• self-broadening
• self-consistent field
• self-energy
• self-excitation
• self-feeding
• self-gravitation
• self-luminous
• self-luminous body
• self-luminous object
• self-recording
• self-recording microphotometer
• self-registering
• self-reversal
• self-winding
• selsyn
• Selvyn granularity law
• semiannual term
• semiconducting bolometer
• semiconductor
• semidiameter
• semidiurnal secular
• semi-indirect illumination
• semi-infinite atmosphere
• semi major axis
• semimajor axis
• semi minor axis
• semiminor axis
• semipermanent Hα
• semiregular variables
• sensibility
• sensibilization
• sensitive
• sensitive amplifier
• sensitive bolometer
• sensitive emulsion
• sensitive film
• sensitiveness
• sensitive receiver
• sensitive region
• sensitive to light
• sensitivity
• sensitivity curve
• sensitivity distribution
• sensitivity of system
• sensitivity pattern
• sensitization
• sensitize
• sensitized
• sensitizer
• sensitizing
• sensitometric processing
• sensory system
• separably degenerated
• separation
• separation angle
• separation image
• septet multiplet
• sequence
• sequence of galactic types
• sequence of structural forms
• sequence star
• series
• series discontinuity
• series disintegration
• series limit
• series of observations
• Serrurier truss
• service
• servo
• servomechanism
• servomotor
• servosystem
• servo system
• set
• set of comparison stars
• set of observations
• set rate
• setting
• setting circle
• setting error
• setting motion
• setting on star
• seven-inch transit circle
• sextant
• sextet multiplet
• sextet state
• shade number
• shade tube
• shadow
• shadow-band pattern
• shadow bands
• shadow-band structure
• shadow method
• shadow pattern
• shadow photometer
• shadow transit
• shaft
• Shanghai observatory
• shape
• shape of pulse
• sharp edge
• sharpening
• sharp image
• sharp series
• sharp solar limb
• shearing interferometer
• sheet reflector
• shell
• shell of gas
• shell spectrum
• shell star
• shell structure
• shield
• shielding
• shift
• shininess of the Moon's surface
• ship
• shock front
• shock tube
• shock wave
• shooting star
• short burst
• short dipole
• short duration burst
• short-focus objective
• short-lived burst
• short-period
• short-period comet
• short-period erratic motions
• short-period perturbation
• short scan
• shortward
• short-wave end
• short-wave fade-out
• short-wave radiation
• shot effect
• shot noise
• shoulder
• shower
• shower meteor
• shutter
• shutter aperture
• shutter arches
• shutter exposure
• shutter mechanism
• shutter opening
• side
• side effect
• sidelobe
• side lobe
• sidelobe level
• sidelobe response level
• sidereal
• sidereal clock
• sidereal day
• sidereal drive
• sidereal mean daily motion
• sidereal month
• sidereal period
• sidereal period of rotation at the equator
• sidereal rate
• sidereal-rate tracking mechanism
• sidereal rotation
• sidereal rotation period
• sidereal second
• sidereal time
• sidereal time at mean midnight
• sidereal year
• sideriostat
• siderite
• siderolite
• siderostat
• Siding Springs observatory
• Siegbahn unit
• sighting telescope
• sight line
• sight-line velocity
• sigma orbital
• sign
• signal
• signal generator
• signal/noise
• signal/noise performance
• signal-noise ratio
• signal/noise ratio
• signal power
• signal-to-noise
• signal-to-noise level
• signal-to-noise ratio
• signature of metric
• sign convention
• significance level
• significant figures
• sign of the zodiac
• silica
• silicon
• silicon photocell
• silver bromide emulsion
• silver bromide grain
• silver chloride emulsion
• silver-disk pyrheliometer
• silver film
• silver image
• silvering
• silver iodide emulsion
• silverless image
• silver reflectivity
• simple burst
• simple eyepiece
• simple harmonic oscillator
• simple interferometer
• simple lens
• simplified model
• simulator
• single antenna
• single aperture
• single-beam spectrometer
• single-emulsion film
• single exposure
• single flat arrangement
• single frequency observation
• single frequency radiometer
• single-frequency record
• single lens reflex camera
• single-level absorption
• single-picture taking
• single spot
• single star
• singlet
• singlet line
• singlet multiplet
• singlet state
• singlet term
• singularity
• singular state
• S-interaction
• site
• site group
• site surveys
• site telescope
• site testing
• site tests
• six-color photometry
• six-color system
• six-constant method
• sizable telescope
• size
• size measurement
• size orbit size
• skeletal vibration
• sky
• sky atlas
• sky background
• sky brightness
• sky brightness temperature
• sky darkness
• sky glow
• sky light
• sky monitor
• sky noise
• sky of stars
• sky patrol
• sky-patrol
• sky radiation
• sky spectrum
• sky survey
• slab
• S, Λ-
• slap
• slewing
• slewing drive
• slewing-drive assembly
• slewing motion
• slewing motor
• slewing rate
• slew rate
• sliced paraboloid
• slide
• slide carrier
• slit
• slit assembly
• slit image
• slit jaw
• slitless spectrograph
• slit-less spectroscope
• slitless spectrum
• slit mechanism
• slit spectrograph
• slit spectrum
• slit width
• slit-width adjusting screw
• Sloan digital sky survey
• slope
• slope of ray
• slot
• slow-acting developer
• slow development
• slow-drift burst
• slowing-down radiation
• slowly varying component
• slow motion
• slow-motion drive
• slow motion drive assembly
• slow plate
• slow scan
• SLR camera
• small angle relationships
• small-angle scattering
• small-aperture telescope
• small circle
• small diameter source
• smallest detectable signal
• small flare
• small flare event
• small meteor
• small planet
• small-scale motions
• small source
• small telescope
• smart drive
• smeared band
• Smithsonian astrophysical observatory
• smoked glass
• smoothed curve
• smoothing
• smoothing process
• S/N
• Snell's law
• SNO neutrino detector
• SOAR telescope
• socket
• sodium iodide detector
• soft component
• soft developer
• softening of radiation
• soft landing
• soft radiation
• soft X-ray region
• soft X-rays
• SO galaxy
• solar
• solar active region
• solar activity
• solar activity index
• solar antapex
• solar apex
• solar astronomer
• solar atmosphere
• solar attraction
• solar aureole
• solar battery
• solar blind photomultiplier
• solar bombs
• solar burst
• solar calendar
• solar cell
• solar cell array
• solar chromosphere
• solar constant
• solar coordinates
• solar corona
• solar corpuscles
• solar corpuscular stream
• solar cosmic rays
• solar cycle
• solar data
• solar day
• solar deuterium
• solar diagonal
• solar diameter
• solar disk
• solar distance
• solar disturbance
• solar eclipse
• solar-eclipse expedition
• solar eclipse viewer
• solar emission
• solar energy
• solar ephemeris
• solar equator
• solar eruption
• solar evolution
• solar facula
• solar filament
• solar filter
• solar flare
• solar flux
• solar flux density
• solar globe
• solar granulation
• solar granules
• solar haloes
• solar heating
• solar hemisphere
• solar hydrogen vortex
• solar illumination
• solar instrument
• solar interferometer
• solar interior
• solarization
• solarized image
• solar ledger
• solar limb
• solar limb darkening
• solar luminosity
• solar magnetic field
• solar magnetograph
• solar-mapping system
• solar mass
• solar matter
• solar medium
• solar meridian
• solar model
• solar model in deeper layers
• solar modulation phenomena
• solar motion
• solar neighbourhood
• solar neutrino flux
• solar neutrinos
• solar neutrino unit
• solar noise
• solar noise storm
• solar nutation
• solar observations
• solar observatory
• solar observing
• solar outburst
• solar paddle
• solar parallax
• solar patrol
• solar period
• solar phenomena
• solar photosphere
• solar physicist
• solar physics
• solar planets
• solar plasma
• solar plasma probe
• solar pole
• solar probe
• solar prominence
• solar protons
• solar quantities
• solar quiet magnetic secular
• solar radiation
• solar radiation pressure
• solar radio astronomy
• solar radio burst
• solar radio noise
• solar radio observations
• solar radio spectrum
• solar radio wave intensity
• solar radio waves
• solar radius
• solar recording
• solar repulsive force
• solar research
• solar rotation
• solar spectrograph
• solar spectrometer
• solar spectroscopy
• solar spectrum
• solar-spectrum ledger
• solar spectrum lines
• solar spot
• solar spot prominences
• solar studies
• solar surface
• solar surface Hα
• solar survey
• solar system
• solar system distances
• solar-system radar
• solar telescope
• solar temperature
• solar-terrestrial events
• solar-terrestrial relations
• solar tidal wave
• solar time
• solar tower
• solar-type star
• solar ultraviolet radiation
• solar wavelengths
• solar wind
• solar work
• solar X-radiation
• solar X-rays
• solar XUV observations
• solar year
• solid
• solid angle
• solid-block Schmidt
• solid-block Schmidt camera
• solid body
• solid-body rotation
• solid constituent
• solid disk
• solid grains
• solid matter
• solid mirror
• solid particles
• solid propellant
• solid-propellant rocket
• solid Schmidt camera
• solid state detector
• solid-state maser
• solid surface
• solstice
• solution
• sonde
• sound emission
• sounding
• sound propagation
• sound wave
• source
• source brightness distribution
• source concentration
• source count
• source density
• source diameter
• source direction
• source directivity
• source distribution
• source function
• source image
• source major axis
• source model
• source of emission
• source of errors
• source of interference
• source of noise
• source of noise storm
• source of radiation
• source position
• source power
• source region
• source size
• source velocity
• south
• South African astronomical observatory
• South African large telescope
• south bearing
• south celestial pole
• south declination
• south ecliptic pole
• Southern astrophysical research telescope
• southern bearing
• southern hemisphere
• southern latitude
• southern lights
• southern polarity
• southern reference star program
• southern reference star programme
• southern reference stars
• southern sky
• southern stars
• south galactic pole
• south hemisphere
• south pier
• south point
• south polar cap
• south pole
• south stars
• Soviet 6-m telescope
• space
• space absorption
• space astronomy
• space-charge oscillations
• space communication
• spacecraft
• space craft
• spacecraft astronomy
• spacecraft observation
• spacecraft trails
• space-curvature
• spaced antennas
• space density
• space distribution
• spaced receiver method
• space exploration
• space-explorer
• space flight
• space-like
• spaceman
• space medicine
• space navigation
• space observatory
• space optics
• space physics
• space probe
• space-probe
• space quantization
• space research
• space rocket
• space science
• spaceship
• space ship
• space station
• space suit
• space technology
• space telescope
• Space Telescope Science Institute
• space television
• space-time
• space travel
• space vehicle
• space velocity
• spacial distribution
• spacing
• spar
• spark
• spark detector
• spark excitation
• spark spectrum
• spatial
• spatial bandwidth
• spatial brightness
• spatial density
• spatial emission
• spatial filter
• spatial filtering
• spatial frequency
• spatial fringe pattern
• spatial structure
• spatial survey
• spatial velocity
• special color index
• special relativity
• special theory of relativity
• species
• specific absorption
• specification
• specific heat
• specific intensity
• speckle interferometry
• spectra
• spectracon
• spectral absorption
• spectral analysis
• spectral band
• spectral channel
• spectral class
• spectral classification
• spectral classification system
• spectral color
• spectral density
• spectral distribution
• spectral elongation
• spectral emissivity
• spectral energy distribution
• spectral features
• spectral filter
• spectral flux density
• spectral index
• spectral intensity
• spectral irradiation curve
• spectral line
• spectral line broadening
• spectral line curvature
• spectral-line displacement
• spectral line emission
• spectral line intensity
• spectrally pure color
• spectral MW
• spectral observations
• spectral order
• spectral photometry
• spectral range
• spectral region
• spectral resolution
• spectral sensitivity
• spectral sensitizing
• spectral sequence
• spectral series
• spectral term
• spectral transmission curve
• spectral type
• spectral variables
• spectral width
• spectrobologram
• spectrobolometer
• spectro-comparator
• spectrocon
• spectrogram
• spectrograph
• spectrographic
• spectrographic equipment
• spectrographic method
• spectrographic observations
• spectrograph interferometric with selective amplitude modulation
• spectrograph slit
• spectrography
• spectroheliocinematograph
• spectroheliogram
• spectroheliograph
• spectrohelioscope
• spectrometer
• spectrometric
• spectrometry
• spectrophotometer
• spectrophotometric gradient
• spectrophotometric temperature
• spectrophotometry
• spectroscope
• spectroscope slit
• spectroscopic
• spectroscopic absolute magnitude
• spectroscopically
• spectroscopic binary
• spectroscopic binary star
• spectroscopic double star
• spectroscopic measurements
• spectroscopic method
• spectroscopic observations
• spectroscopic parallax
• spectroscopic research
• spectroscopic study
• spectroscopist
• spectroscopy
• spectroscopy, multi-object
• spectrum
• spectrum analysis
• spectrum analyzer
• spectrum height
• spectrum line
• spectrum line intensity
• spectrum-luminosity correlation
• spectrum-luminosity diagram
• spectrum-luminosity relation
• spectrum observations
• spectrum of echo
• spectrum of radio source
• spectrum projector
• spectrum spread
• specular reflection
• speculum
• speculum metal
• speed
• speed changer
• speed of fading
• speed of light
• speed of recession
• sphere
• spherical aberration
• spherical angle
• spherical astronomy
• spherical component
• spherical coordinates
• spherical corrector
• spherical dish
• spherical distribution
• spherical galaxy
• spherical halo
• spherical mirror
• spherical mirror camera
• spherical nebula
• spherical reflector
• spherical south bearing
• spherical subsystem
• spherical top
• spherical-top molecule
• spherical triangle
• spherical trigonometry
• spherochromatic aberration
• spheroid
• spheroidal
• spheroidal galaxy
• spicule
• spider
• spider line
• spill over
• spillover radiation
• spin
• spin casting
• spin doubling
• spin echo
• spin function
• spin-lattice interaction
• spinning electron
• spinning top
• spin orbital
• spin-orbit coupling
• spin-orbit interaction
• spin-orbit multiplet
• spin-orbit splitting
• spinor wave function
• spin quantum number
• spin-relativity doublet
• spin-spin coupling
• spin-spin interaction
• spin temperature
• spin uncoupling
• spiral
• spiral arm
• spiral branch
• spiral formation
• spiral galaxy
• spiraling particle
• spiralling electrons
• spiral nebula
• spiral scan
• spiral structure
• spiral system
• split image
• splitting
• splitting factor
• Spoerer's law
• spontaneous disintegration
• spontaneous emission
• spontaneous emitter
• spontaneously
• spool
• sporadic coronal condensation
• sporadic E F
• sporadic ionization
• sporadic meteor
• sporadic region
• sporadic solar radio emission
• spot
• spot activity
• spot area
• spot diagram
• spot group
• spotlight illumination
• spot model
• spot penumbra
• spot-prominence
• spotted area
• spottedness
• spot umbra
• spot zone
• spray ejection
• spray prominence
• spread
• spread in frequency
• spreading
• spread in spectrum
• spread in time of travel
• spread in velocities
• spread of echo
• spread of observations
• spread velocity
• spring equinox
• Springfield mounting
• spun-cast mirror
• spur
• spurious disk
• spurious effect
• spurious error
• spurious image
• spurious radiation
• Sputnik
• sputtering
• spynor field
• square degree
• squaring-on
• SRS program
• SRS programme
• S s-coupling
• SS-coupling
• SS model
• S star
• Ss-
• SS-
• stability
• stabilized binoculars
• stabilized rocket
• stable emission
• stable equilibrium
• stable prominence
• stage
• stage micrometer
• staggered conformation
• staggering
• stain
• standard
• standard antenna
• standard candle method
• standard catalogue
• standard chromatic diagram
• standard coordinates
• standard development
• standard deviation
• standard epoch
• standard error
• standard error of the mean
• standard eye for colorimetry
• standard eye for photometry
• standard film
• standard-magnitude star
• standard model
• standard n
• standard noise source
• standard position
• standard radar equation
• standard signal generator
• standard source
• standard star
• standard system
• standard time
• standard time signals
• standing wave
• Stanier's distribution
• star
• star atlas
• star background
• star catalog
• star catalogue
• star catalogue work
• star chart
• star chart program
• star cloud
• star cluster
• star-constants
• star density
• star diagonal
• star field
• star formation
• star formation process
• star globe
• star hopping
• star image
• Stark broadening
• Stark effect
• Stark effect broadening
• starlight
• starlike
• starlike object
• star list
• star luminosity
• star map
• star model
• star monitor
• star-navigation
• star near the zenith
• star of advancing spectral type
• star of low metal content
• star pair method
• star photometer
• star place
• star population
• star position
• starry
• star's brightness
• star's disk
• star-shaped
• star's path
• star spectrum
• star's surface
• star stream
• star track
• star tracking
• state
• state odd state
• state of ionization
• state of polarisation
• static gravitational equilibrium
• static model
• static nonempty model
• static universe
• station
• stationary atom
• stationary focal point
• stationary orbit
• stationary prominence
• stationary state
• station of planet
• statistical analysis
• statistical broadening
• statistical distribution
• statistical method
• statistical parallax
• statistical study
• statistical sum
• statistical theory
• statistical treatment
• statistical weight
• statistics
• steady conditions
• steady emission
• steady motion
• steady radiation
• steady state
• steady-state conditions
• steady-state cosmology
• steady-state density
• steady-state hypothesis
• steady-state model
• steady-state model universe
• steady-state theory
• steady-state universe
• steerable antenna
• steerable aperture
• steerable parabolic reflector
• steerable paraboloid
• steerable radio telescope
• steerable reflector
• steerable telescope
• Stefan-Boltzmann constant
• Stefan-Boltzmann law
• Stefan's law
• stellar
• stellar absorption coefficient
• stellar activity
• stellar association
• stellar astronomer
• stellar astronomy
• stellar atmosphere
• stellar brightness
• stellar classification
• stellar cluster
• stellar component
• stellar composition
• stellar constitution
• stellar coordinates
• stellar corona
• stellar deuterium
• stellar diameter
• stellar dilution factor
• stellar disk
• stellar distances
• stellar dynamics
• stellar energy
• stellar evolution
• stellar field
• stellar gas
• stellar hydromagnetics
• stellar image
• stellar intensity interferometer
• stellar interferometer
• stellar interior
• stellar investigations
• stellar light
• stellar luminosity
• stellar magnetic field
• stellar magnitude
• stellar mass
• stellar material
• stellar model
• stellar motions
• stellar nomenclature
• stellar object
• stellar orbit
• stellar parallax
• stellar perturbations
• stellar photography
• stellar photometry
• stellar physics
• stellar plasma
• stellar polarization
• stellar population
• stellar pulsation
• stellar radiation
• stellar radiation field
• stellar radio source
• stellar radius
• stellar remnant of a supernova
• stellar rotation
• stellar scintillation
• stellar seeing monitor
• stellar space density
• stellar spectral MWs
• stellar spectrograph
• stellar spectroscopy
• stellar spectrum
• stellar statistics
• stellar structure
• stellar system
• stellar telescope
• stellar temperature
• stellar temperature scale
• stellar ultraviolet radiation
• stellar universe
• stellar variability
• stellar wind
• stellar work
• stellar world
• step method
• stepped exposure
• step-up excitation
• step wedge
• steradian
• stereocomparator
• stereo comparator
• stereoscopic effect
• Stern-Gerlach experiment
• Steward observatory
• stibsolar
• stiffness
• still image
• stimulated absorption
• stimulated emission
• Stokes law
• Stokes lines
• Stokes parameters
• Stokes' parameters
• stone
• stone meteorite
• Stoneyhurst solar disks
• stony-iron
• stony-iron meteorite
• stony meteorite
• stop
• stop band
• stop bath
• stop down
• stop-over transition
• stopping-down
• storage
• storage efficiency
• storage of plates
• storage time
• storm
• storm and burst component
• storm burst
• Stormer orbits
• storm of meteors
• storm radiation
• storm region
• storm-time secular
• straight line portion
• strain
• stranger atom
• strata
• stratification
• stratopause
• stratoscope
• stratosphere
• stratus
• stratus clouds
• stray factor
• stray light
• streaks
• stream
• streamed figures
• streamer
• Strehl ratio
• strength
• strength of radiation
• strength of radio waves
• stress
• stretching
• stretching vibration
• striae
• string method
• stripped atom
• stripping film
• Stromgren photometry
• strong burst
• strong field
• strong galactic concentration
• strong image
• strong line
• strong source
• strontium
• structural features
• structural forms
• structure
• structure of the universe
• STScI digital sky survey
• Student's test
• study
• style
• S-type star
• Subaru telescope
• subband
• subclass
• subdwarf
• subdwarf star
• subemulsion
• subenvelope
• subfeature
• subflare
• subgiant
• subgiant star
• subgroup
• sublevel
• sublimation
• submillimeter range
• sub-millimeter wave
• submillimeter wavelength range
• subordinate line
• subordinate series
• subpolar
• subshell
• subsidiary maximum
• subsidiary peak
• subsolar point
• subsolar temperature
• substance
• substandard film
• substate
• substation
• subsurface
• subsurface temperature
• subsystem
• subsystem of stars
• successive exposures
• sudden commencement
• sudden commencement storm
• sudden cosmic-noise absorption
• sudden cosmic ray increase
• sudden disappearance
• sudden enhancement of atmospherics
• sudden ionospheric disturbance
• sudden magnetic disturbance
• sudden phase anomaly
• suitable density
• sum
• summation band
• summation rule
• summer
• summer solstice
• summer time
• summit
• sum rule
• sum rule intensity
• sun
• Sun
• sunbeam
• Sun-center distance
• sundial
• sun dial
• sun dog
• Sun-Earth distance
• sunlight
• sunlight exposure
• sunlit
• sunlit aurora
• sunlit face
• sunlit hemisphere
• sunlit side
• sunlit surface
• sunrise
• Sun satellite
• Sun's axis
• Sun's center
• Sun's central density
• Sun's central pressure
• Sun's central temperature
• Sun's disk
• Sun's distance
• sun-seeker
•