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

e
E-2C Hawkeye
EA-6B Prowler
Eagle Nebula (IC 4703)
ear
ear canal
ear ossicles
eardrum
Earhart, Amelia (1897–1937)
Early Bird
early-type star
Earth
Earth, atmosphere
Earth, composition and internal structure
Earth, early history
Earth, oceans
Earth impact craters
Earth probes
Earth Received Time (ERT)
Earth resources satellites
Earth Similarity Index (ESI)
Earth station
Earth-class planet
Earth-crossing asteroid
Earth-grazer
earthlights
Earth-orbit rendezvous
earthquake
Earthshapes
earthshine
Earth-stabilized satellites
East Pacific Rise
Eastern Space and Missile Center
Eastern Test Range
EASTEX
Eastman, George (1854–1932)
ebola
eccentric (machinery)
eccentric jovians
eccentricity
Eccles, John Carew (1903–1997)
eccrine gland
echelle grating
echinoderm
Echiuroidea
echo
Echo balloons
echocardiogram
EchoStar
eclampsia
eclipse
ECLIPSES
eclipsing binary
ecliptic
ecliptic coordinates
eclogite
ecology
ECOLOGY
economical number
ecosystem
ECS (Experimental Communications Satellite)
Eddington, Arthur Stanley (1882–1944)
Eddington (space telescope)
Eddington limit
Eddington number
eddy current
Edelman, Gerald Maurice (1929–2014)
edema
edentate
Ediacaran period
Edison, Thomas Alva (1847–1931)
Edison effect
EDTA
Edwards Air Force Base
EELV (Evolved Expendable Launch Vehicle)
effective exhaust velocity
effector
Effelsberg Radio Observatory
efficiency of a machine
efflorescence
effusive eruption
Efir
egg
Egg Nebula
EGNOS (European Geostationary Navigation Overlay Service)
EGS (Experimental Geodetic Satellite)
Egyptian astronomy
Egyptian fraction
Ehlers-Danlos syndrome
Ehman, Jerry
Ehrenburg, Christian Gottfried (1795–1876)
Ehricke, Krafft Arnold (1917–1984)
Ehrlich, Paul (1854–1915)
Eichler, August Wilhelm (1839–1887)
eidetic image
Eiffel, Alexandre Gustave (1832–1923)
Eigen, Manfred (1927–2019)
eight
eight curve
Eight-burst Nebula (NGC 3132)
Einstein, Albert (1879–1955)
Einstein and the photoelectric effect
Einstein Cross
Einstein Observatory
Einstein problem
Einstein ring
einsteinium
Einstein's annus mirabilis
Einthoven, Willem (1860–1927)
Eisele, Donn F. (1930–1987)
Eiseley, Loren Corey (1907–1977)
Eisenhower, Dwight D. (1890–1969)
ejecta
ejecta blanket
ejection capsule
Ekran
Ekspress
El Niño
Elara
elastic collision
elasticity
elastin
elastomer
elbow
ELDO (European Launcher Development Organisation)
electric arc
electric bell
electric current
electric displacement
electric field
electric flux
electric furnace
electric light
electric motor
electric polarization
electric potential
electric propulsion
electrical cell
electrical circuit
electrical conductance
electrical conductivity
electrical conductor
electrical engineering
electrical insulator
electrical resistance
electric-arc process
electricity
electricity, history of
ELECTRICITY AND MAGNETISM
electrocardiogram
electrochemistry
electrode
electrode potential
electrodynamics
electroencephalograph
electroforming
electroluminescence
electrolysis
electrolyte
electromagnet
electromagnetic field
electromagnetic induction
electromagnetic propulsion
electromagnetic radiation
electromagnetic spectrum
electromagnetism
electrometer
electromotive force
electromyogram
electron
electron, charge on
electron, discovery of
electron affinity
electron bombardment thruster
electron configuration
electron degenerate matter
electron microscope
electron spin resonance
electron temperature
electron transport system
electron tube
electron volt
electronegativity
electronic filter
electronics
ELECTRONICS AND SEMICONDUCTORS
electrophile
electrophoresis
electrophorus
electroplating
electroscope, gold-leaf
electrostatic propulsion
electrostatics
electrothermal propulsion
electroweak force
Elektron
element, chemical
element, orbital
elements, biological abundance
elements, cosmic abundance
elements, terrestrial abundance
Elenin, Comet (C/2010 X1)
elephant
elephantiasis
Elephant's Trunk Nebula
elevator (airplane)
elevator (building)
eleven
elevon
elimination
Ellerman bomb
ellipse
ellipsoid
ellipsoidal joint
ellipsoidal variable
elliptic curve
elliptic function
elliptical galaxy
elliptical geometry
ellipticity
elongation
Eltanin (Gamma Draconis)
Elysium Planitia
embolism
embryo
embryology
embryonic disk
embryonic stem cell
embryophyte
emerald
emergence
emetic
emission
emission line
emission nebula
Empedocles (c. 490–430 BC)
emphysema
empiricism
empty set
En Henduanna (fl. 2350 BC)
enantiomers
Enceladus
encephalitis
Encke, Johann Franz (1791–1865)
Encke's Comet
Encounter 2001 Message
encounter hypothesis
Endeavour
endocarditis
endocardium
endocrine disease
endocrine glands
endocrine system
endocytosis
endoderm
endoliths
endometrial cancer
endometrium
endoplasmic reticulum
endorphin
endoscopes and endoscopy
endoskeleton
endosymbiotic theory
endothelial cell
endothelium
Energia
energy
energy density
energy level
energy-based life
engine
engineering
ENGINEERS AND INVENTORS
engraving
Enif (Epsilon Pegasi)
Enlightenment, The
Ensisheim meteorite
enstatite
entanglement
enteritis
Enterprise (space shuttle)
Enterprise (Star Trek starship)
enthalpy
entrainment
entropy
entry
envelope
Envisat
enzymes
EO (Earth Observing) satellites
Eocene
EOS (Earth Observing System)
Eos family
eosinophil
Ep galaxy
ephedrine
ephemeral region (EFR)
ephemeris
Epicurus (341–270 BC)
epicycle
epicycloid
epidemic
epidemics, from space
epidermis
epidote
epiglottic cartilage
epiglottis
epilepsy
Epimetheus
epiphysis
epiphyte
epistellar jovians
epithelium
epitrochoid
epoch
epoxide
epoxy resin
Epsilon Aurigae
Epsilon Eridani
Epsilon Indi
Epsilon Lyrae
Epstein-Barr virus
equality
equation
equation of light
equation of state
equator
equatorial coordinates
equatorial mounting
equatorial orbit
Equator-S
equilibrium
equilibrium, chemical
equilibrium constant
equilibrium sense
equinox
equipotential surface
equivalence
equivalence principle
equivalent dose
equivalent numbers
equivalent weight
equivalent width
Equuleus (constellation)
ER Ursae Majoris star
era
Eratosthenes of Cyrene (c. 276–c. 195 BC)
ERBE (Earth Radiation Budget Experiment)
erbium
ERBS (Earth Radiation Budget Satellite)
Erdös, Paul (1913–1996)
erg
ergosphere
40 Eridani
Eridanus (constellation)
Eris (Kuiper Belt object)
Erlanger, Joseph (1874–1965)
Eros (asteroid)
erosion
ERS (Earth Resources Satellite)
ERS (Environmental Research Satellite)
eruptive variable
erysipelas
erythrocyte
ESA
Esaki, Leo (1925–)
escalator
escape tower
escape velocity
escarpment
Escher, M(aurits) C(ornelius) (1898–1972)
Escherichia coli
esker
Eskimo Nebula (NGC 2392)
Esnault-Pelterie, Robert (1881-1957)
esophagus
Esrange
ESRIN
ESRO (European Space Research Organisation)
ESSA (Environmental Science Services Administration)
essence
essential amino acid
essential element
essential oil
ESSP (Earth System Science Pathfinder)
ESTEC (European Space Research and Technology Centre)
ester
estrogen
estuary
ET: the Extraterrestrial
Eta Aquilae
Eta Carinae
Eta Carinae Nebula (NGC 3372)
Etalon
etching
Eternity puzzle
ethanal
ethane
ethanoate
ethanoic acid
ethanol
ethene
ethers
ethmoid bone
ethyl compounds
ethylene glycol
ETS (Engineering Test Satellite)
E-type asteroid
eucrite
Euclid
Euclidean geometry
Euclid's postulates
Eudoxus of Cnidus (c. 400–c. 347 BC)
Eugenia (asteroid)
eugenics
euglenoid
eukaryote
eukaryotic cell
Euler, Leonhard (1707–1783)
Euler characteristic
Euler circuit
Euler path
Euler square
Euler-Mascheroni constant
Euler's conjecture
Euler's identity
Euler's formula for polyhedra
Eumetsat (European Meteorological Satellite Organization)
Eunomia family (of asteroids)
euphotic zone
Europa (moon)
Europa (asteroid)
European Southern Observatory (ESO)
European Space Agency (ESA)
europium
Eustachian tube
Eustachio, Bartolomeo (1524–1574)
Eutelsat
Eutheria
eutrophication
EUVE (Extreme Ultraviolet Explorer)
Evans, Ronald E. (1933–1990)
evaporation
evaporite
event horizon
event monitor
Everett III, Hugh (1925–1982)
Everett-Wheeler interpretation, of quantum mechanics
evergreen
Evershed effect
evolute
evolution
evolution and isolation
evolutionary theory and extraterrestrial life
Ewing, James Alfred (1855–1935)
Ewing's sarcoma
Excelsior, Project
excessive blood clotting
excitation
excited state
excretion
excretory system
exfoliation
exhaust velocity
exit pupil
exocrine glands
exocytosis
ExoMars
exomoon
exon
exoplanets
EXOPLANETS AND SUBSTELLAR OBJECTS
Exosat
exoskeleton
exosphere
exotic matter
expansion
expansion of liquids
EXPERIMENTAL AIRCRAFT
expiration
Explorer
explosives
exponent
exponential
exposure age
extended source
extended wear contact lenses
external carotid artery
external female genitalia
external jugular vein
external oblique muscle
extinction, biological
extinction, interstellar
extraction
extragalactic background light
extragalactic reference frame
EXTRATERRESTRIAL AND NON-HUMAN INTELLIGENCE
extraterrestrial civilizations, ancient
extraterrestrial civilizations, hazards to
extraterrestrial civilizations, lifetime
extraterrestrial civilizations, types
extraterrestrial intelligence, character
extraterrestrial intelligence, forms
extraterrestrial intelligence, implications following first contact
extraterrestrial intelligence, likelihood
extraterrestrial intelligence, more advanced than us
extraterrestrial intelligence, procedures following first contact
extraterrestrial life, detection
extraterrestrial life, likelihood
extraterrestrial life, variety
extraterrestrial probe
extravehicular activity
extreme horizontal branch star
extremely large telescope
extremophile
EXTREMOPHILES
extremum
extrusion
extrusive
eye
eye relief
eyebrow
eyelid
eyepiece
eyepoint
Eyes, The (NGC 4435 and 4438)
eyespot
Eyraud, Achille (1821–1882)