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- E CentauriE Centauri is a single star in the southern constellation of Centaurus. It is a white-hued
- E-type asteroidE-type (enstatite achondrite–type) asteroids are asteroids thought to have enstatite (MgSi
- E. M. AntoniadiGreek-French astronomer
- Eagle NebulaOpen cluster in the constellation Serpens
- Earendel (astronomical object)Distant star or star cluster
- EarthThird planet from the Sun
- Earth analogPlanet with environment similar to Earth's
- Earth orientation parametersIn geodesy and astrometry, earth orientation parameters (EOP) describe irregularities in t
- Earth phasePhases of Earth as seen from the Moon
- Earth radiusDistance from the Earth surface to a point near its center
- Earth trojanAsteroid with which Earth shares its orbit around the Sun
- Earth-grazing fireballMeteoroid that enters Earth's atmosphere and leaves again
- Earth-grazing meteoroid of 13 October 1990Fireball meteoroid observed above Czechoslovakia and Poland
- Earth's orbitTrajectory of Earth around the Sun
- Earth's shadowShadow that Earth casts through its atmosphere and into outer space
- EarthlightLight reflected from the Earth
- Eberhard GrünGerman astronomer (born 1942)
- Eberswalde (crater)Crater on Mars
- EBLM J0555−57Triple star system in the constellation Pictor
- Eccentric anomalyIn orbital mechanics, the eccentric anomaly is an angular parameter that defines the posit
- EclipseAstronomical event where one body is hidden by another
- Eclipse cycleCalculation and prediction of eclipses
- Eclipse seasonPeriod when eclipses can occur
- Eclipses in mythology and cultureOverview of beliefs regarding eclipses
- EclipticApparent path of the Sun on the celestial sphere
- Ecliptic coordinate systemCelestial coordinate system used to describe Solar System objects
- Ecliptic Plane Input CatalogDatabase of stars and planets
- Ed van den HeuvelDutch astronomer (born 1940)
- Eddington experiment1919 observations which confirmed Einstein's theory of general relativity
- Eddington luminosityAstrophysical limit on radiation from stars
- Eddington MedalRoyal Astronomical Society award for research in theoretical astrophysics
- Édmée ChandonFrench astronomer (1885–1944)
- Edward Emerson BarnardAmerican astronomer (1857–1923)
- Edward L. G. BowellEdward L. G. "Ted" Bowell (born 1943 in London, died August 21 2023 in Flagstaff, Arizona)
- Edward SpiegelEdward A. Spiegel (1931 — January 2, 2020) was an American professor of astronomy at Colum
- Edwin DunkinBritish astronomer
- Effective potentialThe effective potential (also known as effective potential energy) combines multiple, perh
- Effective temperatureCalculated property of a star or planet
- Effects of Planet Nine on trans-Neptunian objectsThe hypothetical Planet Nine would modify the orbits of extreme trans-Neptunian objects vi
- Egg NebulaProtoplanetary nebula
- EGS-zs8-1High-redshift Lyman-break galaxy
- EGSY8p7Galaxy in the constellation Boötes
- Egyptian astronomyAstronomy in Ancient Egypt
- Eileen FrielAmerican astronomer
- Einstein CrossGravitationally lensed image of a quasar
- Einstein TowerObservatory
- EjectaParticles ejected from an area
- Ejecta blanketLayer of material thrown out of an impact crater
- EK EridaniStar in the constellation Eridanus
- El Gordo (galaxy cluster)Largest distant galaxy cluster observed
- Electional astrologyForm of astrology used for planning events
- Electroweak epochPeriod in the evolution of the early universe
- Elephant trunk (astronomy)Type of interstellar matter formation in molecular clouds
- Elephant's Trunk NebulaNebula in the constellation Cepheus
- Elihu BoldtAmerican astrophysicist (1931–2008)
- Elisa QuintanaElisa Victoria Quintana is a scientist working in the field of astronomy and planetary sci
- Elisabeth HeveliusAstronomer from Danzig (1647–1693)
- Ellen HowellAmerican astronomer and planetary scientist
- Elliptical galaxySpherical or ovoid mass of stars
- Elly DekkerElisabeth (Elly) Dekker (Haarlem, 1943) is a Dutch astronomer and science historian, speci
- ELODIE spectrographELODIE was an echelle spectrograph installed on the 1.93m reflector at the Observatoire de
- Elysium (volcanic province)Second largest volcanic region of Mars
- Eminescu (crater)Eminescu is a peak ring crater on Mercury 125 kilometers (78 mi) in diameter. Since there
- Eminescu quadrangleQuadrangle on Mercury
- Emission nebulaNebula formed of ionized gases that emit light of various wavelengths
- Emma TeelingEmma Caroline Teeling MRIA is an Irish zoologist, geneticist and genomicist, who specialis
- EnceladusNatural satellite orbiting Saturn
- Enceladus (giant)In Greek mythology, Enceladus (Ancient Greek: Ἐγκέλαδος, romanized: Enkélados) was one of
- Enceladus Life Signatures and HabitabilityAstrobiology concept mission
- EndpaperThe endpapers or end-papers of a book (also known as the endsheets) are the pages that con
- Endurance (crater)Endurance is an impact crater lying situated within the Margaritifer Sinus quadrangle (MC-
- Energetic Gamma Ray Experiment TelescopeInstrument on NASA's Compton Gamma Ray Observatory satellite
- Engraved Hourglass NebulaPlanetary nebula in the constellation Musca
- Eos familyAsteroid family in the outer asteroid belt
- Ephemeris timeTime standard used in astronomical ephemerides
- EPIC 204376071Star noted for unusual dimming events
- Epitome Astronomiae CopernicanaeBook by Johannes Kepler
- Epoch (astronomy)Moment in time used as a reference point in astronomy
- EponymPerson or thing after which something is named
- EpsilonFifth letter of the Greek alphabet
- Epsilon AurigaeMultiple star system in the constellation of Auriga
- Epsilon BoötisDouble star in Boötes
- Epsilon Canis MajorisStar in the constellation Canis Major
- Epsilon CarinaeBinary star in the constellation Carina
- Epsilon CassiopeiaeStar in the constellation Cassiopeia
- Epsilon CentauriStar in the constellation Centaurus
- Epsilon ChamaeleontisStar in the constellation Chamaeleon
- Epsilon Coronae AustralisEpsilon Coronae Australis (ε CrA), is a star system located in the constellation Corona Au
- Epsilon CorviRed giant star in the constellation Corvus
- Epsilon CygniStar in the constellation Cygnus
- Epsilon EridaniStar in the constellation Eridanus
- Epsilon Eridani bGas giant orbiting Epsilon Eridani
- Epsilon GeminorumStar in the constellation Gemini
- Epsilon GruisStar in the constellation Grus
- Epsilon HydraeVariable star in the constellation Hydra
- Epsilon IndiStar system in the constellation of Indus
- Epsilon Indi AbGas giant orbiting Epsilon Indi A
- Epsilon LeonisStar in the constellation Leo
- Epsilon LeporisStar in the constellation Lepus
- Epsilon LupiMultiple star system
- Epsilon LyraeEpsilon Lyrae (ε Lyr, ε Lyrae), also known as the Double Double, is a multiple star system
- Epsilon OphiuchiStar in the constellation Ophiuchus
- Epsilon PegasiStar in the northern constellation of Pegasus
- Epsilon PerseiStar system in the constellation Perseus
- Epsilon SagittaeEpsilon Sagittae (ε Sagittae) is a solitary, yellow-hued star in the northern constellatio
- Epsilon SagittariiBinary star in the constellation Sagittarius
- Epsilon ScorpiiBinary star in the constellation Scorpius
- Epsilon VirginisStar in the constellation Virgo
- Equation of timeApparent solar time minus mean solar time
- Equatorial coordinate systemCelestial coordinate system used to specify the positions of celestial objects
- Equatorial ridge on IapetusTerrain feature on Saturn's third-largest moon
- EquinoxSemi-annual astronomical event where the Sun is directly above the Earth's equator
- Equinox (celestial coordinates)Astronomical location
- Equivalent doseAbsorbed dose of ionizing radiation weighted with the quality factor
- Equivalent radiusRadius of a circle or sphere equivalent to a non-circular or non-spherical object
- EquuleusConstellation in the northern celestial hemisphere
- ER Ursae MajorisVariable binary star system in the constellation Ursa Major
- ER VulpeculaeVariable star in the constellation Vulpecula
- EratosthenianLunar geologic period
- Eric BecklinAmerican astrophysicist
- Eric G. BlackmanEric Glen Blackman (born September 21, 1968 in Rochester, New York) is an American astroph
- Eridanus (constellation)Constellation in the southern hemisphere
- Eridanus ClusterThe Eridanus Cluster is a galaxy cluster roughly 23 Mpc (75 Mly) from Earth, containing ab
- Eridanus GroupGalaxy cluster in the constellation Eridanus
- Erik Ian AsphaugAmerican astronomer
- Erika Böhm-VitenseAmerican astrophysicist (1923–2017)
- Eris (dwarf planet)Most massive dwarf planet
- Erminia CalabreseItalian astronomer (born 1984)
- Ernest FlammarionErnest Flammarion (French pronunciation: ; May 30, 1846, Montigny-le-Roi - January 21, 193
- Ernest William BrownEnglish-American astronomer and mathematician (1866–1938)
- Escape velocityConcept in celestial mechanics
- Esens, Lower SaxonyEsens is a municipality in the district of Wittmund, in Lower Saxony, Germany. It is situa
- ESO 3.6 m TelescopeOptical reflecting telescope in Chile
- Esquel (meteorite)Esquel is a meteorite found near Esquel, a Patagonian town in the northwest part of the pr
- Eta ApodisStar in the constellation Apus
- Eta AquariidsMeteor shower
- Eta AquilaeMultiple star in the constellation Aquila
- Eta AurigaeStar in the constellation Auriga
- Eta BoötisBinary star system in the constellation Boötes
- Eta Canis MajorisBlue supergiant star in the constellation Canis Major
- Eta CarinaeStellar system in the constellation Carina
- Eta CassiopeiaeBinary star system in the constellation Cassiopeia
- Eta CentauriStar in the constellation Centaurus
- Eta CepheiStar in the constellation Cepheus
- Eta CetiStar in the constellation Cetus
- Eta CorviStar in the constellation of Corvus
- Eta DraconisStar in the constellation Draco
- Eta GeminorumStar in the constellation Gemini
- Eta HerculisStar in the constellation Hercules
- Eta LeonisEta Leonis (η Leo, η Leonis) is a third-magnitude blue supergiant star in the constellatio
- Eta MuscaeEta Muscae is a multiple star system in the southern constellation of Musca. It is visible
- Eta OphiuchiStar in the constellation Ophiuchus
- Eta OrionisStar in the constellation Orion
- Eta PegasiBinary star in the constellation Pegasus
- Eta SagittariiStar in the constellation Sagittarius
- Eta ScorpiiBinary star in the constellation Scorpius
- Eta SerpentisStar in the constellation Serpens
- Eta VirginisBinary star in the constellation Virgo
- Eugène Joseph DelporteBelgian astronomer
- Eunomia familyThe Eunomia or Eunomian family (FIN: 502) is a large asteroid family of S-type asteroids n
- Europa (moon)Smallest Galilean moon of Jupiter
- Europa Imaging SystemEuropa Clipper's visible-light camera system
- Europa Ultraviolet SpectrographUltraviolet spectrograph imager
- European Association for Astronomy EducationOrganization
- European Astronomical SocietyThe European Astronomical Society (EAS) is a learned society, founded under the Swiss Civi
- European Solar TelescopeThe European Solar Telescope (EST) is a pan-European project to build a next-generation 4-
- European Space Astronomy CentreESA center specialized in space astronomy
- European VLBI NetworkNetwork of radio telescopes across Europe that link together for radio interferometry
- EV LacertaeStar in the constellation Lacerta
- EveningPeriod of the day
- Event horizonRegion in spacetime from which nothing can escape
- Event Horizon TelescopeGlobal radio telescope array
- EverythingAll that exists
- Evidence of water on Mars found by Mars Reconnaissance OrbiterThe Mars Reconnaissance Orbiter's HiRISE instrument has taken many images that strongly su
- Ewine van DishoeckDutch astronomer and chemist
- EX LupiT-Tauri star
- ExocometComet outside the Solar System
- ExoMarsAstrobiology programme of the European Space Agency
- ExomoonMoon beyond the Solar System
- ExoplanetPlanet outside of the Solar System
- Exoplanet interiorsExoplanet internal structure
- Exoplanet naming conventionCurrent system of naming exoplanets
- Exoplanet orbital and physical parametersThis page describes exoplanet orbital and physical parameters.
- Exotic starHypothetical types of stars
- Exozodiacal dustSmall particles between exoplanets
- Expansion of the universeIncrease in distance between parts of the universe
- Expiration dateLast date to sell or use something
- Exploration of IoThe exploration of Io, Jupiter's innermost Galilean and third-largest moon, began with its
- Exploration of MercurySending probes to the solar system's smallest major planet
- Exploration of NeptuneNeptune has been directly explored by one space probe, Voyager 2, in 1989. As of 2026, the
- Exploration of PlutoThe exploration of Pluto began with the arrival of the New Horizons probe in July 2015, th
- Exploration of SaturnThe exploration of Saturn has been performed solely by crewless probes. Three missions wer
- Exploration of UranusExploration in space
- Exploration Upper StageThe Exploration Upper Stage (EUS) is a rocket stage under development that will be used fo
- Explorer 18Explorer 18, also called IMP-A, IMP-1, Interplanetary Monitoring Platform-1 and S-74, was
- Extinct cometComet that lacks typical activity
- Extinction (astronomy)Interstellar absorption and scattering of light
- Extragalactic astronomyStudy of astronomical objects outside the Milky Way Galaxy
- Extragalactic background lightAccumulated radiation in the universe
- Extragalactic planetPlanet that is outside the Milky Way galaxy
- Extraterrestrial intelligenceHypothetical intelligent extraterrestrial life
- Extraterrestrial lifeLife that does not originate on Earth
- Extraterrestrial liquid waterLiquid water naturally occurring outside Earth
- Extraterrestrial sample curationUse and preservation of extraterrestrial samples
- Extraterrestrial Sample Curation CenterObservation facility of JAXA
- Extraterrestrial skyExtraterrestrial view of outer space
- Extraterrestrial UFO hypothesisHypothesis that some unidentified flying objects are created by extraterrestrial life
- Extraterrestrial vortexVortex on non-Earth planets with atmospheres
- Extraterrestrials in fictionFictional depictions of extraterrestrial life
- Extravehicular activityActivity done by an astronaut outside a spacecraft
- Extreme helium starLow-mass supergiant that is almost devoid of hydrogen
- Extreme trans-Neptunian objectSolar system objects beyond the other known trans-Neptunian objects
- Extreme ultravioletUltraviolet light with a wavelength of 10–121nm
