e
E-2C Hawkeye
EA-6B Prowler
Eagle Nebula (IC 4703)
Early Bird
early warning (EW) satellites
early-type galaxy
early-type star
ear
ear canal
ear ossicles
eardrum
Earhart, Amelia (1897-1937)
Earth
Earth, atmosphere
Earth, early history
Earth, oceans
Earth impact craters
Earth observation satellite
Earth probes
Earth Received Time (ERT)
Earth resources satellites
Earth station
Earth-class planet
Earth-crossing asteroid
Earth-grazer
earthlights
Earth-orbit rendezvous
earthquake
Earthshapes
earthshine
Earth-stabilized satellites
Eastern Space and Missile Center (ESMC)
Eastern Test Range (ETR)
EASTEX
eccentric jovians
eccentric orbit
eccentricity
eccrine gland
echelle grating
echelle spectrograph
echinoderm
Echo balloons
echocardiogram
EchoStar
E-class asteroid
eclipse
eclipse season
ECLIPSES
eclipsing binary
ecliptic
ecliptic coordinates
ecological system
ECOLOGY
economical number
ecosphere
ecosystem
ECS (European Space Agency Communications Satellite)
ECS (Experimental Communications Satellite)
ectotherms
Eddington, Arthur Stanley (1882-1944)
Eddington (space telescope)
Eddington limit
Eddington number
Edelson, Robert E.
edge
edge of chaos
Ediacaran period
Edison effect
Edwards Air Force Base
EELV (Evolved Expendable Launch Vehicle)
effective exhaust velocity
effective nuclear charge
effective radius
effector
Effelsberg Radio Observatory
efferent
efficiency of a machine
Efir
effusive eruption
egg
Egg Nebula (CRL 2688)
EGNOS (European Geostationary Navigation Overlay Service)
egress
Egryn Lights
EGS (Experimental Geodetic Satellite)
Egyptian astronomy
Egyptian fraction
Ehman, Jerry
Ehricke, Krafft Arnold (1917-1984)
Eigen, Manfred
eigenvalue
eight
eight curve
Eight-burst Nebula (NGC 3132)
Einstein, Albert (1879-1955)
Einstein and the photoelectric effect
Einstein Cross (G2237+030)
Einstein Observatory
Einstein problem
Einstein ring
Einstein-Rosen bridge
Eisele, Donn F. (1930-1987)
Eiseley, Loren Corey (1907-1977)
Eisenhower, Dwight D. (1890-1969)
ejecta
ejecta blanket
ejection capsule
Ekran
Ekspress
Elara
elastic collision
elastic limit
elasticity
elastin
elbow
ELDO (European Launcher Development Organisation)
electric current
electric displacement
electric field
electric motor
electric propulsion
electrical cell
electrical circuit
electrical conductance
electrical conductor
electrical insulator
electrical resistance
ELECTRICITY AND MAGNETISM
electrocardiogram
electrode
electrolysis
electrolyte
electromagnet
electromagnetic propulsion
electromagnetic field
electromagnetic radiation
electromagnetic spectrum
electromagnetic wave
electromagnetism
electromotive force
electron
electron bombardment thruster
electron configuration
electron degenerate matter
electron temperature
electron volt
electronegativity
electrophoresis
electrostatic propulsion
electrothermal propulsion
electroweak force
Elektron
element, chemical
element, orbital
elementary function
elementary particle
elements, biological abundance
elements, cosmic abundance
elements, terrestrial abundance
Elephant's Trunk Nebula
eleven
elevon
ELINT (electromagnetic intelligence)
Ellerman bomb
ellipse
ellipsoid
ellipsoidal variable
elliptic ascent
elliptic curve
elliptic function
elliptical galaxy
elliptical geometry
ellipticity
Elodie
elongation
elsewhere
Eltanin (Gamma Draconis)
Elysium Planitia
embedding
embryo
embryonic stem cell
emergence
Emilie
emirp
emission
emission line
emission nebula
emission spectrum
empath
empty set
En Henduanna (fl. 2350 BC)
enantiomers
enantiomers, bias in terrestrial life
enantiomorph
Enceladus
Encke, Johann Franz (1791-1865)
Encke’s Comet
encounter hypothesis
Encounter 2001 Message
Endeavour
endocrine glands
endocrine system
endocytosis
endoderm
endoliths
endometrium
endoplasmic reticulum
endorphin
endosperm
endosymbiotic theory
endothelial cell
endothelium
Energia
Energia Rocket & Space Corporation (RSC Energia)
energy
energy density
energy-based life
engine
Enif (Epsilon Pegasi)
enormous theorem
Ensisheim meteorite
enstatite
Enterprise (space shuttle)
Enterprise (Star Trek starship)
enthalpy
entrainment
entrance pupil
entropy
entry
envelope
environmental engine
environmental space chamber
Envisat
enzymes
EO (Earth Observing) satellites
Eocene
eosinophil
EORSAT (ELINT Ocean Reconnaissance Satellite)
EOS (Earth Observing System)
Eos family
Ep galaxy
ephemeral region (EFR)
ephemeris
epicenter
Epicurus (341-270 BC)
epicycle
epicycloid
epidemics, from space
epidermis
epidural anesthesia
epiglottis
Epimetheus
epiphysis
epistellar jovians
epithelial
epithelium
epitrochoid
epoch
EPORN
Epsilon Aurigae
Epsilon Eridani
Epsilon Indi
Epsilon Lyrae
Epstein-Barr virus
equation of light
equation of the center
equation of time
equator
equatorial bulge
equatorial coordinates
equatorial mounting
equatorial orbit
Equator-S
equichordal point
equilateral
equilibrium
equinox
equipotential surface
equivalence principle
equivalent dose
equivalent numbers
equivalent width
Equuleus (constellation)
ER Ursae Majoris star
Eratosthenes of Cyrene (c.276-c.194 BC)
ERBE (Earth Radiation Budget Experiment)
ERBS (Earth Radiation Budget Satellite)
ergodic
ergosphere
40 Eridani
Eridanus (constellation)
Eris (minor planet 136199)
Eros (minor planet 433)
EROS (Experience pour la Recherche d'Objet Sombres)
ERS (Earth Resources Satellite)
ERS (Environmental Research Satellite)
eruptive variable
erythrocyte
ESA
escape energy
escape tower
escape trajectory
escape velocity
escape-velocity orbit
Escher, M(aurits) C(ornelius) (1898-1972)
escribed circle
Eskimo Nebula (NGC 2392)
Esnault-Pelterie, Robert (1881-1957) ESO
ESO Coudé Échelle Spectrometer
ESOC (European Space Operations Center)
esophagus
Esrange
ESRIN
ESRO (European Space Research Organisation)
essential amino acid
ESSA (Environmental Science Services Administration)
ESSP (Earth System Science Pathfinder)
ESTEC (European Space Research and Technology Centre)
ester
estrogen
ET
ET: the Extraterrestrial
Eta Aquilae
Eta Carinae
Eta Carinae Nebula (NGC 3372)
Etalon
ETH
ethane
ethanol
ethene
Eternity puzzle
ethers
ETI
ETS (Engineering Test Satellite)
eubacteria
eucrite
Euclid
Euclidean geometry
Euclid’s postulates
Eudoxus of Cnidus (c. 400-c. 347 BC)
Eugenia (minor planet 45)
eukaryote
eukaryotic
eukaryotic cell
Euler, Leonhard (1707-1783)
Euler characteristic
Euler circuit
Euler line
Euler path
Euler square
Euler-Mascheroni constant
Euler's conjecture
Euler's formula
Euler's formula for polyhedra
Eumetsat (European Meteorological Satellite Organization)
Eunomia Family (of asteroids)
Europa
Europa (minor planet 52)
Europa, future probes
Europa, life on
Europa, ocean on
Europa Orbiter
Europa Vostok Initiative
European Northern Observatory (ENO)
European Southern Observatory (ESO)
European Space Agency (ESA)
Eurospace
Eustachian tube
Eutelsat
EUV
EUVE (Extreme Ultraviolet Explorer)
Evans, Ronald E. (1933-1990)
evaporation
even function
event
event horizon
Everett-Wheeler interpretation, of quantum mechanics
Evershed effect
evolute
evolution
evolutionary theory and extraterrestrial life
Excelsior, Project
excitation
excited state
excluded middle law
excretory system
exhaust nozzle
exhaust stream
exhaust velocity
existence
exit pupil
exobiology
exocrine glands
exocytosis
exon
exoplanets
Exosat
exoskeleton
exosphere
exotic matter
expansion ratio
expendable launch vehicle
EXPERIMENTAL AIRCRAFT
Exploration of Neighboring Planetary Systems (ExNPS)
Explorer
explosive bolt
exponent
exponential
EXPORT
exposure age
extended source
extended wear contact lenses
external female genitalia
extinction, biological
extinction, interstellar
extragalactic background light (EBL)
extragalactic reference frame
Extrasolar Planet Foundation
Extrasolar Planet Observational Research Team (EXPORT)
extrasolar planets
extrasolar planets, detection
extrasolar planets, searches
extraterrestrial
EXTRATERRESTRIAL AND NON-HUMAN INTELLIGENCE
extraterrestrial civilizations, ancient
extraterrestrial civilizations, hazards to
extraterrestrial civilizations, lifetime
extraterrestrial civilizations, types
extraterrestrial hypothesis (ETH)
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 (EVA)
extreme horizontal branch star (EHB star)
extreme Population I star
Extreme Ultraviolet Explorer (EUVE)
extremely large telescope
extremophile
EXTREMOPHILES
extrinsic variable
extrusive
eye relief
eyepiece
eyepoint
Eyes, The (NGC 4435 and 4438)
eyespot
EZ Rocket