Worlds of David Darling
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D galaxy
D lines
D meson
dacite
Dactyl
Daedalus, Project
daguerreotype
Daimler, Gottlieb (1834–1900)
Dale, Henry Hallet (1875–1968)
D'Alembert's principle
Dalton, John (1766–1844)
Dalton's law of partial pressures
Dam, Carl Peter Henrik (1895–1976)
Damblanc, Louis (1889–1969)
Damocloid family
damping
Dandelin spheres
Daniken, Erich von (1935–)
Daphnis
DARA (Deutsche Agentur für Raumfahrtangelegenheiten)
Darby family
dark adaptation
dark energy
dark galaxy
dark halo
dark halo crater
dark matter
dark nebula
dart
Darwin (project)
Darwin, Charles Robert (1809–1892)
Darwin, Erasmus (1731–1802)
datolite
Davida (minor planet 511)
Davis, Ray(mond) Jr. (1914–2006)
Davisson, Clinton Joseph (1881–1958)
Davisson and Germer experiment
Davy, Humphry (1778–1829)
Dawes' limit
dawn
Dawn (asteroid mission)
dawn rocket
dawn-dusk orbit
day
Day the Earth Stood Still, The
Daylight Comet of 1910
daylight disk
daylight stream
db galaxy
de Broglie and matter waves
de Concilio, Januarius (1836–1898)
de Duve, Christian (1917–2013)
de Forest, Lee (1873–1961)
de LaTour, Cagniard (1777–1859)
de Laval, Gustav (1845–1913)
de Laval nozzle
de L'Hôpital, Guillaume François Antoine, Marquis de (1661–1704)
de Malve's theorem
de Méré's problem
de Moivre, Abraham (1667–1754)
de Moivre's theorem
de Sitter model
de Vaucouleurs, Gérard Henri (1918–1995)
de Vries, Hugo (1848–1935)
deafness
deamination
death
DeBakey, Michael Ellis (1908–2008)
debris avalanche
Debus, Kurt H. (1908–1983)
Debye, Peter Joseph Wilhelm (1884–1966)
decagon
decapod
decay constant
decaying orbit
deceleration
decibel (dB)
deciduous tree
decimal
decimal fraction
decimal place
Declaration of Principles (... Following Detection of ETI)
declination
decomposition, chemical
decompression sickness
decongestant
Dee, John (1527–1609)
deep fascia
Deep Impact
deep sky object
deep space
Deep Space 1 (DS1)
Deep Space 2 (DS2)
Deep Space Communications Complex (DSCC)
Deep Space Network (DSN)
Deep Space Station (DSS)
deep vein thrombosis
deflector shield
Defoe, Daniel (1660–1731)
DeFrance, Smith J. (1896–1985)
degaussing
degenerate electron pressure
degenerate matter
degenerate neutron pressure
degenerate star
degree
degree of freedom
dehydration
Deimos
Deinococcus radiodurans
deism
del
Delaporte, Eugène Joseph (1882–1955)
delayed neutron
Delbrück, Max (1906–1981)
deletion
deliquescence
delirium
delirium tremens
delocalization
Delphinus (constellation)
delta (river)
Delta (rocket)
Delta IV Heavy
Delta Cephei
Delta Cephei star
Delta Clipper
delta curve
delta rays
Delta Scuti star
delta V
deltahedron
deltoid
deltoid muscle
deluge collection pond
Dembowska (minor planet 349)
dementia
demography
demineralization
Democritus of Abdera (c.470–400 BC)
demography
Demosat (Demonstration Satellite)
denaturation
dendrite
Deneb (Alpha Cygni)
Deneb Kaitos (Beta Ceti)
Denebola (Beta Leonis)
dengue fever
Denning, William Frederick (1848–1931)
denominator
Denpa
densitometer
density
density parameter
density wave
dental nerve
dentition
denudation
de-orbit burn
deoxyribonucleic acid (DNA)
deoxyribose
deposition
depressant
depression (medical condition)
depression (meteorology)
depth of field
depth perception
Derham, William (1657–1735)
derivative
derived unit
Dermaptera
dermatitis
dermis
Desargues, Girard (1591–1661)
Descartes, Rene (1596–1650)
descending node
descent path
descriptive geometry
Desdemona
desert
desiccator
Design Argument
desorption
Despina
Destination Moon
Destiny Laboratory
destructive margin
Desulfotomaculum
detonator
detection of life
detergent
determinant
determinism
deterministic system
deuterium
development vehicle
DEVELOPMENTAL BIOLOGY AND EMBRYOLOGY
Devil's curve
Devonian period
dew
dew point
Dewar, James (1842–1923)
Dewar flask
Dewdney, Alexander Keewatin (1941–)
Dewey, John (1859–1952)
dextrin
dextrorotatory
diabetes
diabetes insipidus
diabetes mellitus
diabetic heart disease
diabetic neuropathy
diabetic retinopathy
diagenesis
diagonal
diagonal matrix
dialysis
diamagnetism
Diamant
diameter
diametric drive
diamond
diamond ring effect
diapause
diaphragm
diarrhea
diastase
diatom
diazepam
diazonium compound
dicarboxylic acid
dice
dichroism
dichromate
Dick, Thomas (1774–1857)
Dicke, Robert Henry (1916–1997)
dicotyledon
Diderot, Denis (1713–1784)
dielectric
dielectric constant
Diels, Otto Paul Hermann (1876–1954)
Diels-Alder reaction
diene
Diesel, Rudolf (1858–1913)
diesel engine
diffeomorphism
difference equation
differential
differential geometry
differential rotation
differential sail
differential topology
differentiation
diffraction
diffraction grating
diffraction pattern
diffraction-limited
diffuse galactic light
diffuse interstellar bands (DIBs)
diffuse nebula
diffusion
digestion
digestive system
Digges, Leonard (c.1520–c.1559) and Thomas (c.1545–1595)
digimetic
digit
digital root
Digital Sky Survey (DSS)
digitalis
digitoxin
digoxin
digraph
dihedral angle
dike
dimension
dimensional analysis
dimensionality
dimorphism
dinoflagellate
dinosaur
dinosaurs, intelligent
Diocles (c.240–c.180 BC)
diode
diode sail
dioecious plant
diogenite
diol
Dione
Dione photo gallery
Diophantine approximation
Diophantine equation
Diophantus of Alexandria (AD c.200–c.284)
dioptre
diorite
dip
dip needle
diphtheria
diploblastic
diplococcus
diplodocus
diploid
dipole moment
Diptera
Dirac, Paul Adrien Maurice (1902–1984)
direct (rotation)
direct ascent
direct broadcast satellite (DBS)
direct flight
direct proportion
directed graph
directed panspermia
direction finder
directional antenna
directivity
directrix
Dirichlet, Peter Gustav Lejeune (1805–1859)
Dirichlet's theorem
disaccharides
discharge tube
discontinuity
discordant redshift
Discoverer
Discovery (Shuttle Orbiter)
Discovery Program
discrete
discrete radio source
discriminant
discus fish
disease
disinfectant
disjunction
disjunction drive
disk (mathematics)
disk (astronomy)
disk, galactic
disk galaxy
disk star
dislocation
disme
Disney, Walt (1901–1966)
Disney monorail
dispersion
displacement
displacement current
disproportionation
dissection
disseminated intravascular coagulation
dissipative structure
dissociation
distal
distillation
distortion
distortion illusion
distributive
diuretic
diurnal
div
diverge
divergent evolution
diving, deep-sea
diving bell
divining rod
division
Dixon, Robert S. (1939–)
DLR (Deutschen Zentrum für Luft und Raumfahrt)
DME (Direct Measurement Explorer)
DMSP (Defense Meteorological Satellite Program)
DNA (deoxyribonucleic acid)
DNA repair
DNA replication
DNA sequencing
Dnepr
Dobrovolsky, Georgy Timofeyevich (1928–1971)
Dobsonian telescope
Dobzhansky, Theodosius (1900–1975)
dock
docking (spacecraft)
dodecagon
dodecahedron
DODGE (Department Of Defense Gravity Experiment)
doldrums
dolerite
Dollfus, Audouin Charles (1924–2010)
Dollond, John (1706–1761)
dolomite
dolphins, as a form of alien intelligence
domain (bio.)
domain (math.)
dominant
Dominian Astrophysical Observatory (DAO)
domino
domino problem
Donati, Giovanni Battista (1826–1873)
Donati's Comet (C/1858 L1)
Dong Fang Hong (DFH)
donor
Doolittle, James ("Jimmy") Harold (1896–1993)
"Doomsday" asteroid
Doomsday Machine
dopamine
dopant
Doppler, Christian Andreas (1803–1853)
Doppler boosting
Doppler broadening
Doppler effect
Doppler radar
Doppler shift
Doppler tracking
Dorado (constellation)
dormancy
Dornberger, Walter (1895–1980)
Dornier, Claude (1884–1969)
dorsal
dosimeter
double beta decay
Double Cluster (h and Chi Persei; NGC 869 and NGC 884)
double helix
double integral
double planet
Double Quasar (Q0957+561A/B)
double radio source
double refraction
double star
double-mode variable
doublet
Douglas Skyrocket
Douglass, Andrew Ellicott (1867–1962)
Dow, Herbert Henry (1866–1930)
downlink
downrange
Down's syndrome
dowsing
dowsing and a possible magnetic sense
Doyle, Arthur Conan (1859–1930)
DQ Herculis star
Draco (constellation)
Draco Dwarf
drag
drag coefficient
drag form factor
DRAGN (double radio source associated with a galactic nucleus)
Dragon (spacecraft)
Dragon's Egg
Drake, Edwin Laurentine (1819–1880)
Drake, Frank Donald (1930–)
Drake Equation
Drake's cryptogram
Draper, Charles Stark (1901–1987)
Draper, Henry (1837–1882)
Draper, John William (1811–1882)
Dream Chaser
dreams
Drew, Charles Richard (1905–1950)
Dreyer, John Louis Emil (1852–1926)
drift
drift orbit
drift-scan
drogue
drone
Drosophila
drought
drowned coast
drowning
DRTS (Data Relay Test Satellite)
drug
drumlin
drupe
dry cell
dry cleaning
dry ice
Dry Valleys, Antarctica
dry weight
Dryden, Hugh Latimer (1898–1965)
drying oil
DS4G (dual-stage 4-grid) ion engine
Dryden Flight Research Center
Dschubba (Delta Scorpii)
DSCS (Defense Satellite Communications System)
DSP (Defense Program Support)
DSPS (Defense Support Program Satellite)
D-type asteroid
du Prel, Carl (1839–1899)
dual spin
dual
dual thrust
dualism
Dubhe (Alpha Ursae Majoris)
dubnium
duct
duct propulsion
ductility
Dudeney, Henry Ernest (1857–1930)
Duke, Charles Moss, Jr. (1935–)
Dulong, Pierre Louis (1785-1838)
Dulong and Petit's law
Dumas, Jean Baptiste André (1800–1884)
Dumbbell Nebula (M27, NGC 6853)
dumortierite
dune
Dunham, Theodore (1897–1984)
dunite
Dunlop, James (1793–1848)
Dunlop, John Boyd (1840–1921)
Dunn, Louis G. (1908–1979)
Dunning, John Ray (1907–1975)
Dunsany, Lord (1878–1957)
duodecimal
duodenum
Dupin cyclide
duplicating the cube
duplication
dura mater
duralumin
Durant III, Frederick Clark (1916–)
Dürer, Albrecht (1471–1528)
Dürer's shell curve
dust
Dust Bowl
dust detector
dust disk
dust lane
dwarf bacteria
dwarf Cepheid
dwarf elliptical galaxy
dwarf galaxy
dwarf irregular galaxy
dwarf molecular cloud
dwarf planet
dwarf spheroidal galaxy
dwarf star
Dwingeloo 1
DX Cancri
DXS (Diffuse X-ray Spectrometer)
dye
dynamic behavior
dynamic load
dynamic pressure
dynamic response
dynamic stability
dynamical method
dynamical system
dynamical time
dynamical timescale
dynamics
Dynamics Explorer
dynamite
dynamometer
Dyna-Soar
dyne
dysbarism
dysentery
Dyson, Frank Watson (1868–1939)
Dyson, Freeman John (1923–)
Dyson civilization
Dyson slingshot
Dyson sphere
dysprosium