| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z | ||||
| Description | alt | broader | narrower | related |
|---|---|---|---|---|
| damping constant (dampingConstant) | ||||
|
damping constant |
line formation
, radiation damping , radiative braking |
|||
| Danjon astrolabe (DanjonAstrolabe) | ||||
|
Danjon astrolabe |
astrolabe | |||
| dark adaption (darkAdaption) | ||||
|
dark adaption |
retinal adaption |
color vision
, darkness , night vision , vision |
||
| dark cloud (darkCloud) | ||||
|
dark cloud |
interstellar matter | C II region | ||
| dark-current calibration (darkCurrentCalibration) | ||||
|
dark-current calibration |
calibration | CCD detector | ||
| FVH: new (2007-OCT-3) | ||||
| Dark Energy (DarkEnergy) | ||||
|
Dark Energy |
dark energy |
Dark Matter
, Hubble law , cold Dark Matter , cosmological constant , cosmology , early universe , galaxy count , galaxy distribution , general theory of relativity , redshift distance relation , redshift magnitude relation , space-time curvature , universe |
||
| FVH: new (2007-SEP-21) | ||||
| Dark Matter (DarkMatter) | ||||
|
Dark Matter |
intergalactic matter
, interstellar matter |
baryonic Dark Matter
, cold Dark Matter |
Dark Energy
, Galactic rotation , cosmology , elementary particle , galaxy rotation curve , mass distribution |
|
| dark nebula (darkNebula) | ||||
|
dark nebula |
absorption nebula |
interstellar matter
, nebula |
Bok globule
, cometary globule |
Wolf diagram
, globule , star formation |
| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z | ||||
| Description | alt | broader | narrower | related |
| darkness (darkness) | ||||
|
darkness |
dark adaption
, diurnal variation , electromagnetic radiation , optical property , visible radiation |
|||
| darkroom (darkroom) | ||||
|
darkroom |
photographic processing
, photography |
|||
| darmtadtium (darmtadtium) | ||||
|
darmtadtium (atomic number 110) |
Ds | fundamental chemical element | ||
| FVH: new (2007-OCT-25) | ||||
| DA star (DaStar) | ||||
|
DA white dwarf star |
white dwarf |
DB star
, DO star |
||
| FVH: modified from original DA_star (2007-OCT-1) | ||||
| data acquisition (dataAcquisition) | ||||
|
data acquisition |
counter
, counting , data analysis , digital recorder , observation , observing technique |
|||
| data analysis (dataAnalysis) | ||||
|
data analysis |
analysis | error analysis |
data acquisition
, data processing , data reduction , data storage , determination |
|
| database (database) | ||||
|
database |
data base | computing |
data center
, data retrieval , data storage , virtual observatory |
|
| data center (dataCenter) | ||||
|
data center |
computer
, data processing , data reduction , data retrieval , data storage , database , on-line system , virtual observatory |
|||
| data processing (dataProcessing) | ||||
|
data processing |
computing |
Monte Carlo technique
, data reduction , numerical analysis |
auto-correlation
, clean method , computer program , computer , cross-correlation , data analysis , data center , data retrieval , data storage , error analysis , observing technique , on-line system , reduction method |
|
| data reduction (dataReduction) | ||||
|
data reduction |
data processing |
computer
, data analysis , data center , data retrieval , data storage , error analysis , fine analysis , reduction method |
||
| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z | ||||
| Description | alt | broader | narrower | related |
| data retrieval (dataRetrieval) | ||||
|
data retrieval |
computing |
data center
, data processing , data reduction , data storage , database , virtual observatory |
||
| data storage (dataStorage) | ||||
|
data storage |
computing |
RAID array
, analog recorder |
computer
, data analysis , data center , data processing , data reduction , data retrieval , database |
|
| DB star (DbStar) | ||||
|
DB white dwarf star |
helium-rich star
, white dwarf |
DA star
, DO star |
||
| FVH: new (2007-OCT-1) | ||||
| DDO photometry (DdoPhotometry) | ||||
|
DDO photometry |
medium band photometry
, photometric system |
|||
| dead-time calibration (deadTimeCalibration) | ||||
|
dead-time calibration |
calibration | |||
| FVH: new (2007-OCT-3) | ||||
| decay oscillation (decayOscillation) | ||||
|
decay of oscillation |
amplitude
, oscillation , radiation damping |
|||
| deceleration (deceleration) | ||||
|
deceleration |
acceleration
, deceleration parameter |
|||
| deceleration parameter (decelerationParameter) | ||||
|
deceleration parameter |
q-parameter | cosmological parameter |
cosmological distance scale
, deceleration |
|
| Declination (Declination) | ||||
|
Declination |
celestial latitude |
latitude
, equatorial coordinate system |
Right Ascension
, celestial equator , equator , equatorial zone |
|
| deconvolution (deconvolution) | ||||
|
deconvolution |
||||
| combine with other terms | ||||
| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z | ||||
| Description | alt | broader | narrower | related |
| defect (defect) | ||||
|
defect |
||||
| combine with other terms | ||||
| deformation (deformation) | ||||
|
deformation |
||||
| combine with other terms | ||||
| degenerate dwarf (degenerateDwarf) | ||||
|
degenerate dwarf star |
degenerate star | white dwarf | ||
| degenerate matter (degenerateMatter) | ||||
|
degenerate matter |
matter |
black hole
, degenerate star |
||
| degenerate star (degenerateStar) | ||||
|
degenerate star |
degenerate matter
, subluminous star |
degenerate dwarf
, neutron star , pulsar |
collapsed star
, mass-radius relation |
|
| delta delphini star (deltaDelphiniStar) | ||||
|
delta Delphini star |
delta Scuti star
, pulsating variable star |
|||
| delta Scuti star (deltaScutiStar) | ||||
|
delta Scuti star |
AI Velorum star |
multi-periodic variable star
, pulsating variable star , short period variable star |
delta delphini star |
He II ionization zone
, dwarf Cepheid , kappa mechanism , non-radial pulsation , radial pulsation |
| dense cloud (denseCloud) | ||||
|
dense cloud |
interstellar matter
, nebula |
|||
| densitometer (densitometer) | ||||
|
densitometer |
measuring instrument |
densitometry
, microdensitometer |
||
| densitometry (densitometry) | ||||
|
densitometry |
densitometer | |||
| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z | ||||
| Description | alt | broader | narrower | related |
| density bounded (densityBounded) | ||||
|
density bounded |
density | |||
| density (density) | ||||
|
density |
specific gravity |
atmospheric density
, electron density , energy density , gas density , mass density |
Rankine-Hugoniot relation
, density bounded , density distribution , density fluctuation , density perturbation , density variation , density wave model |
|
| density distribution (densityDistribution) | ||||
|
density distribution |
density | |||
| density fluctuation (densityFluctuation) | ||||
|
density fluctuation |
density | |||
| density perturbation (densityPerturbation) | ||||
|
density perturbation |
density | |||
| density variation (densityVariation) | ||||
|
density variation |
density | |||
| density wave model (densityWaveModel) | ||||
|
density wave model |
density | |||
| descending node (descendingNode) | ||||
|
descending node |
node | |||
| FVH: moved NODES to BT (2007-OCT-1) | ||||
| design (design) | ||||
|
design |
engineering | research | ||
| combine with other terms | ||||
| de Sitter universe (deSitterUniverse) | ||||
|
de Sitter universe |
cosmology | |||
| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z | ||||
| Description | alt | broader | narrower | related |
| destruction (destruction) | ||||
|
destruction |
||||
| combine with other terms | ||||
| detached binary star (detachedBinaryStar) | ||||
|
detached binary star |
binary star | W Ursae Majoris star | semi-detached binary star | |
| detection (detection) | ||||
|
detection |
signal detection | |||
| combine with other terms | ||||
| detector array (detectorArray) | ||||
|
detector array |
array | array processor | ||
| detector (detector) | ||||
|
detector |
instrument |
X-ray detector
, dust detector , infrared detector , multi-channel detector , photographic emulsion , photomultiplier tube , radiometer , superconducting tunnel junction , synchronous detector , two-dimensional detector , ultraviolet detector |
charge-coupled device
, charge-injection device , charge-transfer device , limiting magnitude , pixel , quantum efficiency , receiver , remote sensing , semiconductor device , sensitivity , shot noise , shutter , signal detection , telescope instrument |
|
| FVH: added NT SUPERCONDUCTING_TUNNEL_JUNCTION (2007-SEP-21) | ||||
| only the broad classes are shown below; specific type will be found under these, or from the hierarchical list | ||||
| determination (determination) | ||||
|
determination |
data analysis
, measurement , quantization |
|||
| deuterium (deuterium) | ||||
|
deuterium, an isotope of hydrogen |
hydrogen | isotope | ||
| D galaxy (DGalaxy) | ||||
|
rotationally symmetric elliptical galaxy (Yerkes classification scheme) |
elliptical galaxy
, galaxy |
cD galaxy |
Yerkes classification
, massive galaxy |
|
| diagram (diagram) | ||||
|
diagram |
||||
| combine with other terms | ||||
| diameter (diameter) | ||||
|
diameter |
dimension |
angular diameter
, isophotal diameter |
Baade-Wesselink method
, occultation , surface gravity |
|
| combine with other terms | ||||
| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z | ||||
| Description | alt | broader | narrower | related |
| diamond ring effect (diamondRingEffect) | ||||
|
diamond ring effect |
Sun
, bailys bead , solar eclipse |
|||
| dichroic mirror (dichroicMirror) | ||||
|
dichroic mirror |
mirror |
optical film
, optical filter |
||
| Dicke radiometer (DickeRadiometer) | ||||
|
Dicke radiometer |
radiometer | |||
| differential equation (differentialEquation) | ||||
|
differential equation |
mathematical analysis | |||
| differential image motion monitor (differentialImageMotionMonitor) | ||||
|
differential image-motion monitor |
DIMM | seeing monitor | ||
| FVH: new (2007-SEP-21) | ||||
| differential rotation (differentialRotation) | ||||
|
differential rotation |
rotation |
Galactic rotation
, galaxy , galaxy rotation curve , globular star cluster , tidal disruption , tidal distortion |
||
| FVH: added RT Galactic_rotation, RT galaxy_rotation_curve (2007-OCT-5) | ||||
| diffraction (diffraction) | ||||
|
diffraction |
X-ray diffraction |
Airy disk
, Rayleigh criterion , diffraction patterns , interference wave , shadow band |
||
| diffraction grating (diffractionGrating) | ||||
|
diffraction grating |
grating | optical component |
VPH grating
, echelle grating , objective grating , reflection grating , transmission grating |
grating spectrograph
, grism , spectrum , spectrograph |
| diffraction patterns (diffractionPatterns) | ||||
|
diffraction patterns |
diffraction | |||
| diffuse nebula (diffuseNebula) | ||||
|
diffuse nebula |
nebula | |||
| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z | ||||
| Description | alt | broader | narrower | related |
| diffuse radiation (diffuseRadiation) | ||||
|
diffuse radiation |
||||
| combine with other terms | ||||
| diffusion (diffusion) | ||||
|
diffusion |
||||
| combine with other terms | ||||
| digital image (digitalImage) | ||||
|
digital image |
image | |||
| digital recorder (digitalRecorder) | ||||
|
digital recorder |
data acquisition | |||
| dimension (dimension) | ||||
|
dimension |
diameter | |||
| combine with other terms | ||||
| diode array (diodeArray) | ||||
|
diode array |
array
, multi-channel detector |
reticon array | ||
| diode (diode) | ||||
|
diode |
electronic equipment | |||
| dioptric system (dioptricSystem) | ||||
|
dioptric system |
optical system |
lens
, optical telescope |
||
| dipole antenna (dipoleAntenna) | ||||
|
dipole antenna |
dipole antennas |
antenna
, directional antenna |
dipole | |
| dipole (dipole) | ||||
|
dipole |
half-wave dipole |
dipole antenna
, electric charge , electric dipole |
||
| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z | ||||
| Description | alt | broader | narrower | related |
| dirac cosmology (diracCosmology) | ||||
|
Dirac cosmology |
cosmology | |||
| directional antenna (directionalAntenna) | ||||
|
directional antenna |
directional antennas | antenna |
Mills cross antenna
, Yagi antenna , dipole antenna , parabolic antenna |
|
| dirty snowball theory (dirtySnowballTheory) | ||||
|
dirty snowball theory |
comet
, nucleus celestial object |
|||
| discoloration (discoloration) | ||||
|
discoloration |
||||
| combine with other terms | ||||
| discoveries (discoveries) | ||||
|
discoveries |
research
, space exploration |
|||
| combine with other terms | ||||
| discrete radio source (discreteRadioSource) | ||||
|
discrete radio source |
radio source | |||
| dish antenna (dishAntenna) | ||||
|
dish antenna |
dish antennas | radio telescope |
antenna
, parabolic reflector , radar telescope |
|
| disintegration (disintegration) | ||||
|
disintegration |
||||
| combine with other terms | ||||
| disk (disk) | ||||
|
discs UK disk |
accretion disk
, circumstellar disk , gaseous disk , gravitating disk |
disk flaring
, disk galaxy , disk population , disk star |
||
| disk flaring (diskFlaring) | ||||
|
disc flaring UK disk flaring |
disk
, morphology |
|||
| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z | ||||
| Description | alt | broader | narrower | related |
| disk galaxy (diskGalaxy) | ||||
|
disc galaxy UK disk galaxy |
galaxy |
lenticular galaxy
, spiral galaxy |
disk
, mass distribution |
|
| disk population (diskPopulation) | ||||
|
disc population UK disk population |
population II star |
Galactic plane
, disk , stellar population |
||
| disk star (diskStar) | ||||
|
disc star UK disk star |
population II star |
Galactic plane
, disk , gaseous disk |
||
| dispersion (dispersion) | ||||
|
dispersion |
||||
| combine with other terms | ||||
| disruption (disruption) | ||||
|
disruption |
||||
| combine with other terms | ||||
| dissipation (dissipation) | ||||
|
dissipation |
||||
| combine with other terms | ||||
| distance (distance) | ||||
|
distance |
Bodes law
, absolute magnitude , distance indicator , distance measurement , distance modulus , distance scale , light year , parallax , parsec , range finder , trigonometric parallax |
|||
| distance indicator (distanceIndicator) | ||||
|
distance indicator |
distance
, distance measurement , distance modulus , distance scale |
|||
| distance measurement (distanceMeasurement) | ||||
|
distance measurement |
Cepheid distance
, Faber-Jackson distance , RGB tip distance , SBF distance |
distance
, distance indicator , distance scale |
||
| distance modulus (distanceModulus) | ||||
|
distance modulus |
modulus |
absolute magnitude
, distance , distance indicator , distance scale , parallax |
||
| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z | ||||
| Description | alt | broader | narrower | related |
| distance scale (distanceScale) | ||||
|
distance scale |
cosmological distance scale |
Astronomical Unit
, distance , distance indicator , distance measurement , distance modulus , parsec |
||
| distortion (distortion) | ||||
|
distortion |
optical aberration |
astigmatism
, chromatic aberration , comatic aberration , field curvature , optical system , spherical aberration |
||
| distribution function (distributionFunction) | ||||
|
distribution function |
function |
distribution in space
, frequency distribution , statistics |
||
| in mathematics | ||||
| distribution in space (distributionInSpace) | ||||
|
distribution in space |
distribution function | |||
| combine with other terms | ||||
| diurnal parallax (diurnalParallax) | ||||
|
diurnal parallax |
parallax | horizontal parallax | zenith distance | |
| diurnal phenomena (diurnalPhenomena) | ||||
|
diurnal phenomena |
diurnal variation | |||
| diurnal variation (diurnalVariation) | ||||
|
diurnal variation |
darkness
, diurnal phenomena |
|||
| D layer (DLayer) | ||||
|
D layer |
D region |
Earth atmosphere
, ionosphere |
||
| D line (DLine) | ||||
|
D line |
spectral line | absorption spectrum | ||
| dome (dome) | ||||
|
dome |
telescope dome |
dome seeing
, observatory , telescope , temperature control , ventilation |
||
| excluding lunar dome | ||||
| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z | ||||
| Description | alt | broader | narrower | related |
| dome seeing (domeSeeing) | ||||
|
dome seeing |
seeing |
dome
, ventilation |
||
| Doppler broadening (DopplerBroadening) | ||||
|
Doppler broadening |
line broadening |
Doppler effect
, Stark broadening , Zeeman splitting , line width , natural line width , pressure broadening |
||
| Doppler effect (DopplerEffect) | ||||
|
Doppler effect |
blueshift
, redshift |
Doppler broadening
, line shift , radar , radial velocity , spectroscopic analysis , spectroscopic binary star , stellar motion |
||
| DO star (DoStar) | ||||
|
DO white dwarf star |
white dwarf | PG1159 star |
DA star
, DB star |
|
| FVH: new (2007-OCT-9) | ||||
| double galaxy (doubleGalaxy) | ||||
|
double galaxy |
binary galaxy |
binary system
, galaxy |
companion galaxy
, galaxy merger |
|
| double-mode Cepheid (doubleModeCepheid) | ||||
|
double-mode Cepheid |
beat_Cepheid
, double mode Cepheid |
Cepheid
, double-mode variable star , pulsating variable star |
double-mode pulsation | |
| double-mode pulsation (doubleModePulsation) | ||||
|
double-mode pulsation |
double mode pulsation | multi-periodic pulsation |
double-mode Cepheid
, double-mode variable star , pulsating variable star |
|
| double-mode variable star (doubleModeVariableStar) | ||||
|
double-mode variable star |
double mode variable star |
multi-periodic variable star
, pulsating variable star |
RR Lyrae star
, double-mode Cepheid |
double-mode pulsation |
| double quasar (doubleQuasar) | ||||
|
double quasar |
gravitationally lensed source |
gravitational deflection
, gravitational lensing , quasar |
||
| DQ Herculis star (DqHerculisStar) | ||||
|
DQ Herculis star |
eclipsing binary star
, slow nova |
|||
| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z | ||||
| Description | alt | broader | narrower | related |
| dredge up (dredgeUp) | ||||
|
dredge up |
convection
, giant , metal abundance , stellar atmosphere , stellar interior |
|||
| drift scan (driftScan) | ||||
|
drift scan |
photometry
, radio structure , surface photometry |
|||
| drift wave (driftWave) | ||||
|
drift wave |
wave | |||
| drive (drive) | ||||
|
drive |
coelostat
, control system , siderostat , telescope |
|||
| dubnium (dubnium) | ||||
|
dubnium (atomic number 105) |
Db | fundamental chemical element | ||
| FVH: new (2007-OCT-25) | ||||
| dust cloud (dustCloud) | ||||
|
dust cloud |
cloud
, interstellar matter |
dust
, interstellar dust |
||
| dust detector (dustDetector) | ||||
|
dust detector |
detector | dust | ||
| dust (dust) | ||||
|
dust |
cosmic dust |
intergalactic matter
, interstellar matter |
interplanetary dust
, interstellar dust , zodiacal dust |
comet
, dust cloud , dust detector , dust grain , dust nebula , dust shell , dust storm , gas to dust ratio |
| dust grain (dustGrain) | ||||
|
dust grain |
interstellar matter |
adsorption
, dust |
||
| dust nebula (dustNebula) | ||||
|
dust nebula |
interstellar matter
, nebula |
dust | ||
| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z | ||||
| Description | alt | broader | narrower | related |
| dust shell (dustShell) | ||||
|
dust shell |
circumstellar shell
, shell |
circumstellar dust
, dust , symbiotic star |
||
| dust storm (dustStorm) | ||||
|
dust storm |
dust
, planet , surface of celestial body |
|||
| dwarf Cepheid (dwarfCepheid) | ||||
|
dwarf Cepheid |
irregular variable star
, multi-periodic variable star , pulsating variable star |
Cepheid
, delta Scuti star |
||
| dwarf (dwarf) | ||||
|
dwarf star |
main sequence star |
A dwarf
, B dwarf , F dwarf , G dwarf , K dwarf , M dwarf , O dwarf , black dwarf , flare star , late-type dwarf , nearby dwarf |
brown dwarf
, low-luminosity star , low-mass star , luminosity classification , main sequence , subdwarf |
|
| the term alone refers to main sequence star, but subterms may refer to evolved star | ||||
| dwarf galaxy (dwarfGalaxy) | ||||
|
dwarf galaxy |
galaxy
, peculiar galaxy |
|||
| dwarf nova (dwarfNova) | ||||
|
dwarf nova |
DN |
cataclysmic variable star
, eruptive binary star |
SU Ursae Majoris star
, SX Arietis star , U Geminorum star , WZ Sagittae star , Z Camelopardalis star |
AM Canum Venaticorum star
, UV Persei star , UX Ursae Majoris star , X-ray binary star , accretion disk , emission line star |
| FVH: total update (2007-SEP-24) | ||||
| dwarf planet (dwarfPlanet) | ||||
|
dwarf planet |
rotating body |
Ceres
, Pluto |
planet | |
| dynamical evolution (dynamicalEvolution) | ||||
|
dynamical evolution |
evolution | |||
| dynamical friction (dynamicalFriction) | ||||
|
dynamical friction |
friction | radiative braking | ||
| dynamical parallax (dynamicalParallax) | ||||
|
dynamical parallax |
parallax |
binary star
, kinematic parallax , moving cluster parallax |
||
| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z | ||||
| Description | alt | broader | narrower | related |
| dynamical time (dynamicalTime) | ||||
|
dynamical time |
time | |||
| dynamics (dynamics) | ||||
|
dynamics |
||||
| combine with other terms | ||||
| dynamo theory (dynamoTheory) | ||||
|
dynamo theory |
magnetic field | |||
| dysprosium (dysprosium) | ||||
|
dysprosium (atomic number 66) |
Dy |
fundamental chemical element
, rare earth |
||
| FVH: new (2007-OCT-25) | ||||