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- I Zwicky 18Galaxy in the constellation Ursa Major
- Iani ChaosIani Chaos is a region of chaos terrain at the south end of the outflow channel Ares Valli
- Iapetus (moon)Moon of Saturn
- IAU definition of planet2006 International Astronomical Union definition
- IAU designated constellationsConstellations recognized by the International Astronomical Union
- IAU designated constellations by solid angleList of constellations by area
- IC 10Irregular starburst galaxy in the constellation Cassiopeia
- IC 1101Galaxy in the constellation Virgo
- IC 1459Elliptical galaxy in the constellation of Grus
- IC 2177IC 2177 is a region of nebulosity that lies along the border between the constellations Mo
- IC 2391Open star cluster in the constellation Vela
- IC 2944H II region and open cluster in the constellation Centaurus
- IC 342/Maffei GroupGalaxy cluster in the constellation of Cassiopeia
- IC 348Reflection nebula in the constellation Perseus
- IC 443Supernova remnant in the constellation Gemini
- IC 5146Reflection nebula in the constellation Cygnus
- IC 5148Nicknamed the Spare Tyre Nebula, IC 5148 is a planetary nebula located around 1 degree wes
- IC 5201IC 5201 is a barred spiral galaxy located in the constellation Grus. It is located at a di
- Icarus (journal)Academic journal
- Ice giantType of giant planet
- Icebreaker LifeProposed NASA Mars lander
- Icy moonNatural satellite with a surface mainly composed of ice
- IK PegasiStar in the constellation Pegasus
- Illustris projectComputer-simulated universes
- IM-22025 lunar landing mission
- Immo AppenzellerGerman astronomer (born 1940)
- Impact eventCollision of two astronomical objects
- Impact events on JupiterModern observed impacts on Jupiter
- Indian astronomyAstronomy on the Indian subcontinent
- Indus (constellation)Constellation in the southern celestial hemisphere
- Inertial Upper StageThe Inertial Upper Stage (IUS), originally designated the Interim Upper Stage, was a two-s
- Infrared astronomyObservation of infrared wavelengths
- Infrared dark cloudCold, dense region of a giant molecular cloud
- Infrared Space ObservatoryOrbital satellite telescope
- Infrared Spectrometer for ExoMarsInfrared Spectrometer for ExoMars (ISEM) was an infrared spectrometer for remote sensing d
- Ingenuity (helicopter)Retired NASA helicopter on the Mars 2020 mission
- Initial mass functionEmpirical function in astronomy
- Inner moonNatural satellite orbiting inside the orbit of a larger moon
- Innermost stable circular orbitSmallest stable circular orbit of a particle
- Instability stripRegion of an astronomical diagram
- Institute of Radio-engineering and ElectronicsResearch institute in Moscow, Russia
- Integration timeConcept in astronomy
- Intelsat 35eIntelsat 35e, also known as IS-35e is an Intelsat high-throughput (HTS) geostationary comm
- Interacting galaxyGalaxies with interacting gravitational fields
- Intergalactic dustCosmic dust in between galaxies in intergalactic space
- Intergalactic starStar not gravitationally bound to any galaxy
- Intermediate polarIn astronomy, an intermediate polar (also called a DQ Herculis Star) is a type of cataclys
- Intermediate spiral galaxyAn intermediate spiral galaxy is a galaxy that is in between the classifications of a barr
- Intermediate-mass black holeClass of black holes with a mass range of 100 to 100000 solar masses
- Internal structure of the MoonHaving a mean density of 3,346.4 kg/m3, the Moon is a differentiated body, being composed
- International Astronautical FederationInternational space advocacy organization
- International Celestial Reference System and its realizationsCurrent standard celestial reference system and frame
- International DesignatorAlphanumerical designation for spacecraft
- Interplanetary dust cloudSmall particles between planets
- Interplanetary magnetic fieldMagnetic field within the Solar System
- Interplanetary mediumMaterial which fills the Solar System
- Interstellar cloudAccumulation of gas, plasma, and dust in space
- Interstellar communicationInterstellar communication is the transmission of signals between planetary systems. Sendi
- Interstellar iceIce that forms in the interstellar medium
- Interstellar mediumMatter and radiation in the space between the star systems in a galaxy
- Interstellar objectAstronomical object not gravitationally bound to a star
- Intracluster mediumSuperheated plasma that permeates a galaxy cluster
- Intuitive Machines Nova-CLunar lander developed by Intuitive Machines
- Invariable planePlane passing through the barycenter of a planetary system
- Io (moon)Innermost Galilean moon of Jupiter
- IOK-1IOK-1 is a distant galaxy in the constellation Coma Berenices. When discovered in 2006, it
- Iota CepheiIota Cephei (ι Cephei, ι Cep) is a star in the northern constellation Cepheus. Based upon
- Iota TrianguliIota Trianguli, Latinized from ι Trianguli, is a quadruple star system in constellation of
- IPTF14hlsiPTF14hls is an unusual supernova star that erupted continuously for about 1,000 days begi
- Ira Sprague BowenAmerican physicist and astronomer (1898–1973)
- Irina BelskayaUkrainian astronomer
- Iron planetType of terrestrial planet
- Irregular galaxyClass of galaxy
- Irregular moonCaptured satellite following an irregular orbit
- Irwin I. ShapiroAmerican astrophysicist
- Isaac Newton Group of TelescopesThe Isaac Newton Group of Telescopes or ING consists of three optical telescopes: the Will
- Isabelle BaraffeFrench physicist and academic
- Ishtar TerraTerra on Venus
- Isolated horizonIt was customary to represent black hole horizons via stationary solutions of field equati
- IsophoteIn geometry, an isophote is a curve on an illuminated surface that connects points of equa
- Ithaca ChasmaIthaca Chasma is a valley (graben) of Saturn's moon Tethys, named after the island of Itha
