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- T dwarfBrown dwarf or exoplanet with atmospheric methane
- T PyxidisT Pyxidis (T Pyx) is a recurrent nova and nova remnant in the constellation Pyxis. It is a
- T Tauri starClass of young variable stars
- Tabby's StarStar noted for unusual dimming events
- TAGSAMRegolith scoop used on asteroid Bennu by the NASA probe OSIRIS-REx
- Takeshi UrataJapanese astronomer
- Tantalus FossaeTantalus Fossae is a group of troughs in the Arcadia quadrangle of Mars, located at 50.9°
- Tarantula NebulaH II region in the constellation Dorado
- Tars TarkasTars Tarkas is a fictional character in Edgar Rice Burroughs' Barsoom series. A great warr
- Tau BoötisTau Boötis, Latinised from τ Boötis, is an F-type main-sequence star approximately 51 ligh
- Tau CentauriTau Centauri, Latinized from τ Centauri, is a solitary star in the southern constellation
- Tau CetiSingle yellow-hued star in the constellation Cetus
- Tau HerculidsThe Tau Herculids (TAH #0061) are a meteor shower that when discovered in 1930 appeared to
- TauridsAnnual meteor shower
- Taurus (astrology)Second astrological sign of the zodiac
- Taurus (constellation)Zodiac constellation straddling the celestial equator
- TechnosignatureProperty that provides scientific evidence for the presence of technology
- Telescope Array ProjectThe Telescope Array project is an international collaboration involving research and educa
- TelescopiumConstellation in the southern celestial hemisphere
- Telluric contaminationContamination of astronomical spectra by the Earth's atmosphere
- Tempel 1Jupiter-family comet
- Temporary satelliteA temporary satellite is an object which has been captured by the gravitational field of a
- Terminator (solar)Line dividing day and night on a celestial body
- Terraforming of MarsHypothetical modification of Mars into an Earth-like habitable planet
- Terrestrial gamma-ray flashBurst of gamma rays produced in the Earth's atmosphere
- Terrestrial planetPlanet that is composed primarily of silicate rocks or metals
- Tessera (Venus)A tessera (plural tesserae) is a region of heavily deformed terrain on Venus, characterize
- Tethys (moon)Moon of Saturn
- Thalassa (moon)Thalassa , also known as Neptune IV, is the second-innermost satellite of Neptune. Thalass
- TharsisVolcanic plateau on Mars
- Tharsis MontesMontes on Mars
- Tharsis TholusMartian volcano
- The Privileged Planet2004 book by Guillermo Gonzalez and Jay Richards
- Thebe (moon)Thebe , also known as Jupiter XIV, is the fourth of Jupiter's moons by distance from the p
- Theia (hypothetical planet)Ancient planet that collided with Earth
- Theia MonsVolcano on Venus
- Themis (hypothetical moon)On April 28, 1905, William H. Pickering, who had discovered the Saturnian moon Phoebe seve
- Themis familyAsteroid family
- Theodore Dunham Jr.American astronomer and physicist
- Theoretical astronomyTheoretical astronomy is the use of analytical and computational models based on principle
- Thermal Emission Imaging SystemThe Thermal Emission Imaging System (THEMIS) is a camera on board the 2001 Mars Odyssey or
- ThermophysicsThermophysics is the application of thermodynamics to geophysics and to planetary science
- Theta GruisTheta Gruis, Latinized from θ Gruis, is a triple star system in the southern constellation
- Theta MuscaeTheta Muscae (θ Muscae) is a multiple star system in the southern constellation Musca ("th
- Theta SagittaeTheta Sagittae (θ Sagittae) is a double star in the northern constellation of Sagitta. Wit
- Theta1 Orionis ATheta1 Orionis A (θ1 Ori A) is a variable trinary star in the constellation Orion. Its app
- Theta1 Orionis BTheta1 Orionis B (θ1 Orionis B), also known as BM Orionis, is a multiple star system conta
- Theta1 Orionis DTheta1 Orionis D (θ1 Orionis D) is a member of the Trapezium open cluster that lies within
- Thick diskStructural component of some galaxies
- Thin diskStructural component of galaxies
- Thirty Meter TelescopeFuture observatory in the United States
- TholinClass of molecules formed by ultraviolet irradiation of organic compounds
- Thomas A. HerringThomas A. Herring (born 17 July 1955 in Cooroy, Queensland, Australia) is a geophysicist,
- Thomas BoppThomas Joel Bopp (October 15, 1949 – January 5, 2018) was an American amateur astronomer.
- Thomas BrisbaneBritish Army officer and colonial administrator
- Thomas DiggesEnglish mathematician and astronomer (died 1595)
- Thomas HarriotEnglish astronomer, mathematician, ethnographer and translator
- Thomas Henderson (astronomer)Scottish astronomer and mathematician
- Thomas HenningGerman astrophysicist
- Three-mirror anastigmatA three-mirror anastigmat is an anastigmat telescope built with three curved mirrors, enab
- Tianwen-2Chinese asteroid and comet exploration mission
- Tibetan astrologyTibetan astrology (Tibetan: དཀར་རྩིས, Wylie: dkar rtsis) is a traditional discipline of th
- Tidal accelerationNatural phenomenon due to which tidal locking occurs
- Tidal heatingOrbital and friction heating on a planet or moon oceans, or interior
- Tidal heating of IoDissipation of orbital and rotational friction between Jupiter and Io
- Tidal lockingSituation in which an astronomical object's orbital period matches its rotational period
- Tim de ZeeuwPieter Timotheus "Tim" de Zeeuw (born 12 May 1956 in Sleen) is a Dutch astronomer speciali
- Time in GreeceIn Greece, the standard time is Eastern European Time (Greek: Ώρα Ανατολικής Ευρώπης; EET;
- Time-domain astronomyStudy of how astronomical objects change with time
- Time-lapse photographyFilming technique
- Timekeeping on MarsProposed approaches to tracking date and time on the planet Mars
- Timeline of OpportunityRobotic rover that was active on the planet Mars from 2004 to 2018
- Timeline of Solar System explorationThis is a timeline of Solar System exploration ordering events in the exploration of the S
- Timeline of the far futureScientific projections regarding the far future
- Timothy B. SpahrAmerican astronomer
- Tintoretto (crater)Tintoretto is a crater on Mercury. Its name was adopted by the IAU in 1976, after the Ital
- Tip of the red-giant branchPrimary distance indicator used in astronomy
- Tisserand's parameterOrbit parameter conserved in the three-body problem
- Titan (moon)Largest moon of Saturn
- Titan IIIEExpendable launch system used by NASA
- Titania (moon)Largest moon of Uranus
- Titius–Bode lawHypothesis about Solar System planets' orbits
- Tom GehrelsDutch–American astronomer
- Tombaugh RegioBright region on Pluto
- Torino scaleMeasure for hazard from asteroid or comet impacts on Earth
- Tourism on the MoonFuture plans to make the Moon available for tourism
- Trans-lunar injectionA trans-lunar injection (TLI) is a propulsive maneuver, which is used to send a spacecraft
- Trans-Neptunian objectSolar system objects beyond Neptune
- Transient lunar phenomenonA transient lunar phenomenon (TLP) or lunar transient phenomenon (LTP) is a short-lived ch
- Transit of Deimos from MarsTransit of a moon of Mars
- Transit of MercuryMovement of Mercury across the Sun viewed from further away
- Transit of Phobos from MarsTransit of a moon from Mars
- Transit of VenusAstronomical transit of Venus across the Sun
- Trapezium ClusterOpen cluster in the Orion Nebula in the constellation Orion
- TRAPPISTPair of Belgian optic robotic telescopes
- TRAPPIST-1Red dwarf star in the constellation Aquarius
- TriangulumConstellation in the northern celestial hemisphere
- Triangulum AustraleConstellation in the southern celestial hemisphere
- Triangulum GalaxySpiral galaxy in the constellation Triangulum
- Trifid NebulaEmission nebula in the constellation Sagittarius
- Triple-alpha processNuclear fusion reaction
- TriplicityIn astrology, a triplicity is a group of three signs belonging to the same element.
- Triton (moon)Largest moon of Neptune
- Triton HopperProposed NASA Triton lander space probe
- Trojan (celestial body)Objects sharing the orbit of a larger one
- Tropical yearPeriod of time for the ecliptic longitude of the Sun to increase 360°
- True anomalyParameter of Keplerian orbits
- True northDirection on Earth's surface
- Tsiolkovsky rocket equationMathematical equation describing the motion of a rocket
- Tsurayuki (crater)Tsurayuki is a crater on Mercury. Its name was adopted by the International Astronomical U
- TucanaConstellation in the southern celestial hemisphere
- Tucana DwarfThe Tucana Dwarf Galaxy is a dwarf galaxy in the constellation Tucana. It was discovered i
- Tully–Fisher relationCorrelation between luminosity and emission line width of spiral galaxies
- Tuonela PlanitiaWalled plain on Triton
- TW HydraeT Tauri star in the constellation Hydra
- Twenty-Eight MansionsThe Twenty-Eight Mansions (Chinese: 二十八宿; pinyin: Èrshíbā Xiù), also called xiu or hsiu, a
- TwilightAtmospheric illumination by the Sun below the horizon
- Twin QuasarAstronomical object with two images
- TwinklingVariation in brightness and the position of stars due to atmospheric refraction
- TX LeonisTX Leonis, also known by its Flamsteed designation 49 Leonis, is a triple star system that
- Type Ia supernovaType of supernova in binary systems
- Type Ib and Ic supernovaeTypes of supernovae caused by a star collapsing
- Type II CepheidType of variable stars
- Type II supernovaExplosion of a star 8 to 45 times the mass of the Sun
- Type-cD galaxyGalaxy morphology classification
