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- H chondriteThe H type ordinary chondrites are the most common type of meteorite, accounting for appro
- H I regionInterstellar cloud composed of neutral atomic hydrogen
- H II regionLarge, low-density interstellar cloud of partially ionized gas
- Habitability of binary star systemsPotential conditions for extraterrestrial life in binary star systems
- Habitability of brown dwarf systemsPotential for life-friendly planets orbiting brown dwarfs
- Habitability of F-type main-sequence star systemsProspects for habitable planets orbiting a type-F star
- Habitability of G-type main-sequence star systemsLikelihood of finding extraterrestrial life in yellow dwarf systems
- Habitability of K-type main-sequence star systemsK-type main-sequence stars, also known as orange dwarfs or Goldilocks stars, may be candid
- Habitability of natural satellitesMeasure of the potential of natural satellites to have environments hospitable to life
- Habitability of neutron star systemsPossible factors for life on planets or moons around neutron stars
- Habitability of red dwarf systemsPossible factors for life around red dwarf stars
- Habitable zoneOrbits where planets may have liquid surface water
- Habitable zone for complex lifeConcept in astrophysics
- Hadley–ApennineMoon landing site of American Apollo 15
- Hale TelescopeTelescope at Palomar Observatory in California, USA
- Halley's CometPeriodic comet
- Halo orbitPeriodic, three-dimensional orbit
- Halton ArpAmerican astronomer (1927-2013)
- HamalStar in the constellation Aries
- Hamlet (crater)46°06′S 44°24′E / 46.1°S 44.4°E
- Hanny's VoorwerpAstronomical object appearing as a bright blob, discovered by Hanny van Arkel
- Hans ElsässerHans Friedrich Elsässer (March 29, 1929 in Aalen – June 10, 2003 in Heidelberg) was a Germ
- Harmonice Mundi1619 book by Johannes Kepler
- Haro 11Galaxy in the constellation Sculptor
- Harold D. BabcockAmerican astronomer (1882–1968)
- Hartebeesthoek Radio Astronomy ObservatoryThe Hartebeesthoek Radio Astronomy Observatory (HartRAO) is a radio astronomy observatory,
- Harvard College ObservatoryAstronomical observatory in Cambridge, Massachusetts, United States
- Harvard Plate StacksCollection of astronomical glass negatives
- HAT-P-2bExtrasolar planet
- HATNet ProjectThe Hungarian Automated Telescope Network (HATNet) project is a network of six small fully
- HaumeaDwarf planet with a ring and two moons
- Haumea familyTrans-Neptunian collisional family
- Haute-Provence ObservatoryObservatory
- Hayabusa2Japanese space mission to asteroid Ryugu
- Hayashi limitValue in astrophysics
- Hayashi trackLuminosity–temperature relationship in stars
- HD 10180Star in the constellation Hydrus
- HD 104237Multiple star system in the constellation of Chamaeleon
- HD 107146G-type star in the constellation Coma Berenices with a circumstellar disk
- HD 108Peculiar star in the constellation Cassiopeia
- HD 110458HD 110458 is a single star in the southern constellation of Centaurus. It has the Bayer de
- HD 111915HD 111915 is a single star in the southern constellation of Centaurus. It has the Bayer de
- HD 113766Binary star in the constellation Centaurus
- HD 120987HD 120987 (y Centauri or y Cen) is a star system located in the constellation Centaurus. H
- HD 125248Binary star system in the constellation of Virgo
- HD 133600HD 133600, also known as HIP 73815, is a G-type star in the constellation of Virgo. It has
- HD 134060HD 134060, also known by its Gould designation of 38 G. Circini, is a star in the southern
- HD 137509Star in the constellation Apus
- HD 140283Star in the constellation Libra
- HD 144941Star in the constellation Scorpius
- HD 147506HD 147506, also known as HAT-P-2 and formally named Hunor, is a magnitude 8.7 F8 dwarf sta
- HD 148937Binary star in the constellation Norma
- HD 149026HD 149026, also named Ogma , is a yellow subgiant star approximately 250 light-years from
- HD 149026 bExtrasolar planet in the constellation Hercules
- HD 15082Star in the constellation Andromeda
- HD 164595Star in the constellation of Hercules
- HD 17156Star in the constellation Cassiopeia
- HD 17156 bHD 17156 b, named Mulchatna by the IAU, is an extrasolar planet approximately 255 light-ye
- HD 181433HD 181433 is a star with a system of orbiting exoplanets located in the southern constella
- HD 188753Hierarchical triple star system in the constellation Cygnus
- HD 189733Binary star system in the constellation Vulpecula
- HD 189733 bHot Jupiter exoplanet in the constellation Vulpecula
- HD 191612Binary star in the constellation Cygnus
- HD 19467Star in the constellation Eridanus
- HD 200779HD 200779 (HIP 104092; Gliese 818; LHS 3624) is a solitary star located in the equatorial
- HD 206267HD 206267A is a hierarchical triple star system in the northern circumpolar constellation
- HD 206893Star system in the constellation Capricornus
- HD 20782 bHD 20782 b is an extrasolar planet located approximately 117 light-years away in the const
- HD 209458F-type or G-type star in the constellation Pegasus
- HD 209458 bGas giant exoplanet orbiting HD 209458
- HD 269810Star in the constellation Dorado
- HD 40307 gHD 40307 g is an exoplanet candidate suspected to be orbiting in the habitable zone of HD
- HD 43317Variable star in the constellation Orion
- HD 49434Star in the constellation Monoceros
- HD 50138Star in the constellation Monoceros
- HD 5980Triple star system in the constellation Tucana
- HD 64740Star in the constellation Puppis
- HD 74272HD 74272 is a star in the constellation Vela. It has the Bayer designation n Velorum, whil
- HD 79447HD 79447 is a single star in the southern constellation of Carina. It has the Bayer design
- HD 8357Binary star in the constellation Pisces
- HD 84810Star in the constellation Carina
- HD 93083HD 93083 is an orange-hued star in the southern constellation of Antlia. It has the proper
- HD 93129Triple star system in the constellation Carina
- HD 93521Star in the constellation Leo Minor
- HD 95086 bExoplanet orbiting the young HD 95086
- HD1High-redshift galaxy in the constellation Sextans
- HE 0107−5240Extremely metal poor star in the constellation Phoenix
- HE 0437−5439Hypervelocity star in the constellation Dorado
- HE 0450−2958Galaxy in the constellation Caelum
- HE 1327−2326Very low metallicity star in the constellation Hydra
- Heartbeat starType of variable stellar binary
- Heat death of the universePossible fate of the universe
- Heather CouperBritish astronomer (1949–2020)
- Heber Doust CurtisAmerican astronomer
- Hebrew astronomyAstronomy written in Hebrew or by Hebrew speakers
- Hecates TholusMartian volcano
- HED meteoriteHED meteorites are a clan (subgroup) of achondrite meteorites. HED stands for "howardite–e
- HEGRAFormer gamma-ray telescope
- Heinrich Hertz Submillimeter TelescopeThe Submillimeter Telescope (SMT), formerly known as the Heinrich Hertz Submillimeter Tele
- Heinrich Louis d'ArrestGerman astronomer (1822–1875)
- Helene (moon)Helene is a moon of Saturn. It was discovered by Pierre Laques and Jean Lecacheux in 1980
- Hélène R. DickelAmerican astronomer (born 1938)
- Heliacal risingRising of stars prior to sunrise
- Heliocentric orbitOrbit around the barycenter of the Sun
- HeliometerAstronomical measuring instrument
- Helios (spacecraft)NASA/DLR solar probes launched in 1974–76
- Helios Dust InstrumentationThe Helios 1 and 2 spacecraft each carried two dust instruments to characterize the Zodiac
- HelioseismologyStudy of the structure and dynamics of the Sun through its oscillation
- HeliosphereRegion of space dominated by the Sun
- Heliospheric current sheetSurface of magnetic polarity change
- Helium flashBrief thermal runaway nuclear fusion in the core of low-mass stars
- Helix NebulaPlanetary nebula in the constellation Aquarius
- Hellas PlanitiaPlanitia on Mars
- Hellenistic astrologyAncient Greco-Roman astrology
- Hemingway (crater)Hemingway is a crater on Mercury. It has a patch of very dark material located near its ce
- Hendrik C. van de HulstDutch astronomer and mathematician
- Henize 206Large Magellanic Cloud nebula in the constellation Mensa
- Henri ChrétienFrench astronomer (1879–1956)
- Henri DebehogneBelgian astronomer
- Henri-Alexandre DeslandresFrench astronomer (1853–1948)
- Henry DraperAmerican doctor and amateur astronomer (1837–1882)
- Henry Draper CatalogueAstronomical star catalogue
- Henry Draper MedalAmerican astrophysics award
- Henry Norris Russell LectureshipThe Henry Norris Russell Lectureship is awarded each year by the American Astronomical Soc
- Hephaestus FossaeThe Hephaestus Fossae are a system of troughs and channels in the Amenthes quadrangle of M
- Hera (space mission)Planetary defence spacecraft developed by the ESA
- Herbert GurskyHerbert Gursky (May 27, 1930, Bronx, New York – December 1, 2006) was the Superintendent o
- Herbert Hall TurnerHerbert Hall Turner FRS (13 August 1861 – 20 August 1930) was a British astronomer and sei
- Herbig Ae/Be starYoung stars of spectral types A and B
- Herbig–Haro objectSmall patches of nebulosity associated with newly born stars
- Hercules (constellation)Constellation in the northern celestial hemisphere
- Hercules (dwarf galaxy)Dwarf spheroidal galaxy in the constellation Hercules
- Hercules ClusterGalaxy cluster in the constellation Hercules
- Hercules X-1Binary Star in the constellation Hercules
- Herschel (Mimantean crater)Herschel () is the largest impact crater on the Saturnian moon Mimas. It is located on Mim
- Herschel MedalAward
- Hertzsprung–Russell diagramScatter plot of stars showing the relationship of luminosity to stellar classification
- HesperianEra of Mars' geologic history
- HETE 2High Energy Transient Explorer 2 (HETE-2; also known as Explorer 79) was a NASA astronomic
- HH 46/47Herbig-Haro objects in the constellation Vela
- HI-SEASAnalog habitat for human spaceflight to Mars
- High Accuracy Radial Velocity Planet SearcherInstrument for detecting planets
- High Altitude ObservatoryObservatory
- High Energy Stereoscopic SystemHigh Energy Stereoscopic System (H.E.S.S.) is a system of imaging atmospheric Cherenkov te
- High Energy Transient Explorer 1NASA satellite of the Explorer program
- High Resolution Fly's Eye Cosmic Ray DetectorUltra-high-energy cosmic ray observatory in Utah, United States
- High-energy astrophysicsStudy of astronomical objects that release highly energetic electromagnetic radiation
- High-velocity cloudLarge collections of gas found in the galactic halo of the Milky Way
- HiisiHiisi (Finnish pronunciation: ; plural hiidet ) is a term in Finnic mythologies, originall
- Hilda asteroidGroup of asteroids in orbital resonance with Jupiter
- Hilda familyAsteroid family
- Hill sphereRegion in which an astronomical body dominates the attraction of satellites
- Hills cloudVast, theoretical circumstellar disc
- Himalia (moon)Moon of Jupiter (Jupiter VI)
- Himalia groupThe Himalia group is a group of prograde irregular satellites of Jupiter that follow simil
- HIP 56948Star in the constellation Draco
- HIPASSAstronomical survey for neutral atomic hydrogen
- Hipparchus star catalogAncient astronomical map by Hipparchus
- Hiroshi KanedaJapanese astronomer
- History of astrologyAstrology is a belief in a relation between celestial observations and terrestrial events.
- History of longitudeRecord of humanity's attempts to find east-west position on Earth
- History of Mars observationThe history of Mars observation is about the recorded history of observation of the planet
- History of Solar System formation and evolution hypothesesThe history of scientific thought about the formation and evolution of the Solar System be
- History of supernova observationAncient and modern recorded observations of supernovae explosions
- History of X-ray astronomyThe history of X-ray astronomy begins in the 1920s, with interest in short wave communicat
- Hitomi (satellite)Failed Japanese X-ray astronomy satellite
- HL Tau 76HL Tau 76 is a variable white dwarf star of the DAV (or ZZ Ceti) type. It was observed by
- HL TauriStar in constellation Taurus
- HLX-1Intermediate mass black hole candidate located in the lenticular galaxy ESO 24349
- HM CancriBinary star in the constellation Cancer
- HM SagittaeSymbiotic nova in the constellation of Sagitta
- Hoag's ObjectGalaxy in the constellation Serpens Caput
- Hobby–Eberly Telescope10-meter-aperture telescope in Texas, USA
- Hoher List ObservatoryObservatory
- Hohmann transfer orbitTransfer manoeuvre between two orbits
- Holden (Martian crater)Holden is a 140 km wide crater situated within the Margaritifer Sinus quadrangle (MC-19) r
- Holmdel Horn AntennaMicrowave horn antenna in New Jersey, US
- Homunculus NebulaBipolar emission nebula in the constellation Carina
- Honeysuckle Creek Tracking StationThe Honeysuckle Creek Tracking Station was a NASA Earth station in Australia near Canberra
- Hong Kong Space MuseumThe Hong Kong Space Museum is a public astronomy and space science museum located in Tsim
- Horace W. BabcockAmerican astronomer (1912–2003)
- Horary astrologyForm of astrology for answering questions posed
- HorizonApparent curve that separates earth from sky
- Horizon problemCosmological fine-tuning problem
- Horizontal branchStage of stellar evolution
- Horizontal coordinate systemType of celestial coordinate system
- Horologium (constellation)Constellation in the southern celestial hemisphere
- Horsehead NebulaDark nebula in the constellation Orion
- Horseshoe orbitType of co-orbital motion of a small orbiting body relative to a larger orbiting body
- Hortensius (crater)Hortensius is a small, bowl-shaped lunar impact crater that is located in the northern par
- Hot dark matterTheoretical form of dark matter particles which travel near the speed of light
- Hot JupiterGas giant planet orbiting close to a star
- Hot, dust-obscured galaxyRare type of quasar
- Hour angleCoordinates used in the equatorial coordinate system
- Howard GrubbSir Howard Grubb FRS FRAS (28 July 1844 – 16 September 1931) was an Irish optical engineer
- HR 1099Triple star system in the constellation Taurus
- HR 1614Star in the constellation Eridanus
- HR 2562 bHR 2562 b is a substellar companion orbiting the star HR 2562. Discovered in 2016 by a tea
- HR 3803Star in the constellation Vela
- HR 4796Binary star system in the constellation Centaurus
- HR 8799Star in the constellation Pegasus
- HR 8799 eJovian planet orbiting HR 8799
- HR DelphiniHR Delphini, also known as Nova Delphini 1967, was a nova which appeared in the constellat
- Hubble bubble (astronomy)Variation in the Hubble constant
- Hubble Deep FieldMultiple exposure image of deep space in the constellation Ursa Major
- Hubble Deep Field SouthThe Hubble Deep Field South is a composite of several hundred individual images taken usin
- Hubble sequenceGalaxy morphological classification scheme advocated by Edwin Hubble
- Hubble Ultra-Deep FieldDeep-field space image in Fornax
- Hubble volumeRegion of the observable universe
- Hubble's lawObservation in physical cosmology
- HUDF-JD2Galaxy in the constellation Fornax
- Huge-LQGLarge Quasar Group
- Human Landing SystemLunar landers for the Artemis program
- Human mission to MarsProposed concepts
- Human presence in spacePhysical presence of human activity in outer space
- Human spaceflightSpaceflight with a crew or passengers
- Hungaria asteroidsGroup of asteroids in the asteroid belt that orbit the Sun between 1.78 and 2.00AU
- Hungaria familyAsteroid family
- HW VirginisHW Virginis, abbreviated HW Vir, is an eclipsing binary system (of the Algol type), approx
- Hyades (star cluster)Open cluster in the constellation Taurus
- Hyder flareSlow, large-scale brightening that occurs in the solar chromosphere
- Hydra (constellation)Constellation straddling the celestial equator
- Hydra (moon)Moon of Pluto
- Hydra–Centaurus SuperclusterGalaxy supercluster
- Hydrogen deuterideChemical compound
- Hydrogen-deficient starA hydrogen-deficient star is a type of star that has little or no hydrogen in its atmosphe
- HydrusConstellation in the southern celestial hemisphere
- Hyperbolic asteroidAstronomical object not orbiting the Sun
- Hyperbolic trajectoryConcept in astrodynamics
- Hyperboreae UndaeSand dune field on Mars
- Hypercompact stellar systemCluster of stars around a supermassive black hole
- HypergiantRare star with tremendous luminosity and high rates of mass loss by stellar winds
- Hyperion (moon)Moon of Saturn
- Hyperion proto-superclusterThe Hyperion proto-supercluster is the largest and earliest known proto-supercluster, 5,00
- HypernovaSupernova that ejects a large mass at unusually high velocity
- Hypothetical types of biochemistryPossible alternative biochemicals used by life forms
