T'Lani III: Planet whose population was destroyed by war.
T'Lani Prime: Planet in the T'Lani star system.
T'lli Beta: -Planet.
            -Destination of U.S.S. Enterprise NCC-1701-D when it encountered a school
             of two-dimensional creatures.
Tagra IV: Planet in the Argolis Cluster which was ecologically devastated.
Tagus III: Planet with many archaeological sites.
Talos IV: -Class M planet.
          -Devastated centuries ago by nuclear war.
          -Homeworld to the Talosians.
Tambor Beta VI: White dwarf star where the emergent life-form took U.S.S. Enterprise NCC-1701-D
                to collect vertion particles.
Tantalus V: Location of a Federation penal colony.
Tanuga IV: Planet where Doctor Nel Apgar worked on a Krieger-wave converter.
Tarchannen III: Planet where crew members of U.S.S. Victory NCC-9754 were infected by alien DNA.
Tarella: -Home planet to the Tarellians.
         -Devastated in a biological war.
Taresia: Class M planet in the Delta Quadrant.
Tarod IX: -Planet near the Romulan Neutral Zone.
          -Attacked by the Borg.
Tarok: -Class M moon.
       -Located in Kazon-Ogla space.
       -Located in the Delta Quadrant.
Tarsas III: Planet around which orbits Starbase 74.
Tarsus IV: Site of infamous massacre by Kodos the Executioner.
Tartaras V: Planet that Vash decided to explore instead of returning to Earth.
Tau Alpha C: Little-known homeworld to the Traveler.
Tau Ceti: Star located eight light-years from Earth.
Tau Ceti III: Planet where Captain Jean-Luc Picard met Captain Rixx sometime in 2364.
Tau Ceti Prime: -Planet.
                -Site of a tragic accident in 2358 that claimed the life of Admiral Janeway.
Tau Cygna V: Planet where a Federation colony was established in violation of the Treaty of 
             Armens.
Taugan Sector: Region of space where Dessica II, Calder II, Draken IV and Yadalla Prime are 
               located.
Taurus II: Planet where shuttlecraft Galileo crashed in 2267 while under command of 
           Commander Spock.
Tavela Minor: Planet where Commander Doctor Beverly Cheryl Howard Crusher suggested that
              Lieutenant Junior Grade Nurse Alyssa Ogawa Powell take a vacation.
Teleris: Star cluster that Q invited Vash to visit.
Telfas Prime: -Planet.
              -Located in the Delta Quadrant.
              -Location of a mining community.
Tellar: -Planet.
        -Home of the Tellaritecivilization.
        -Located near Andor, Alpha Centauri, Betazed and Vulcan.
Tellun Star system: System containing planets Elas and Troyius.
Teluridian IV: Planet in the Alpha Quadrant.
Tenarus Cluster: Star system near Kazon space in the Delta Quadrant.
Tendara Colony: -United Federation of Planets world.
                -Annika Hansen, later known as former Borg drone Seven of Nine was born there
                 on Stardate 25479. 
Teplan system: -Planetary system in the Gamma Quadrant.
               -A deadly plague called the blight was unleashed on one of the system's worlds by
                the Dominion.
Terlina III: Planet where Noonien Soong's last laboratory was located.
Terlina system: Solar system where Terlina III is located.
Terosa Prime: Planet.
Tessen III: Federation planet threatened by an asteroid in 2368.
Tethys III: Green planet with hydrogen-helium composition and frozen core.
Thalos VI: -Planet.
           -Gaila was arrested there for vagrancy.
Thalos VII: Planet where cocoa beans are aged for four centuries.
Thanatos VII: Planet where a contaminated plasma conduit was manufactured.
Thasus: Home planet of a noncorporeal civilization known as the Thasians, who cared for young 
        Charles Evans.
Thelka IV: Planet where Captain Jean-Luc Picard discovered a delicious dessert.
Theta 116: Star system that was the final destination for the Charybdis.
Theta Cygni XII: Planet struck by the Denevan Neural Parasites.
Theta VII: Planet that neeeded vaccines from U.S.S. Enterprise NCC-1701.
Tibor Nebula: -Intersellar dust cloud in United Federation of Planets space.
              -Located near Vulcan.
              -A Dominion fleet was intercepted there by Starfleet's 7th Fleet in 2374 during the Dominion war.
Tiburon: -Planet where Doctor Sevrin studied as a research engineer.
         -Location of Zora's inhumane experiments.
Tilonus IV: -Planet.
            -In 2369, Commander William Thomas Riker was subjected to neural manipulation to 
             extract information from him.
Titan: Largest moon of Saturn.
Titus IV: Planet where Chief Miles Edward O'Brien almost stepped on a Lycosa tarantula.
Tohvun III: Neutral planet located neard the Federation-Cardassian border.
Topin system: Planetary system with an unstable protostar.
Torad IV: Planet in the Gamma Quadrant.
Torga IV: -Planet in the Gamma Quadrant.
          -Site of a standoff between the crew of Deep Space 9 and the Jem'Hadar.
Torman V: Planet where Captain Jean-Luc Picard got transportation to Celtris III.
Torna IV: Planet.
Torona IV: Home to the insectoid civilization known as the Jarada.
Torros III: -Planet in Cardassian Union space.
            -Location of a Dominion shipyard destroyed in 2373 by a Starfleet taskforce.
Tracken II: -Planet in the Demilitarized Zone.
            -Site of a Maquis colony.
Triacus: Planet where a Federation science team was driven to suicide by the evil Gorgan.
Trialus Star system: Planetary system in the Gamma Quadrant.
Trill: Class M planet that is home to the joined species known as the Trill.
Triona system: Planet where Lieutenant Keith Rocha was killed by a coalescent organism.
Triskelion: Planet ruled by the Providers for gaming purposes.
Trivas system: -Planetary systein in Cardassian Union space.
               -Location of abandoned Cardassian space station Empok Nor.
Troyius: Planet at war with sister world Elas in 2268.
Turkana IV: -Planet.
            -Site of a failed Federation colony.
            -Birthplace to Lieutenant Natasha Yar.
Tycho IV: Home planet to the vampire cloud creature.
Tyken's Rift: Rupture in the fabric of space.
Typhon Expanse: Huge area of space where U.S.S. Enterprise NCC-1701-D and 
                U.S.S. Bozeman NCC-1941 were trapped in a temporal causality loop.
Tyra system: -Planetary system.
             -Site of a devastating Starfleet defeat in 2374 during the Dominion war. Of the 112
              vessels only 14 survived.
Tyree: -Class-M planet in United Federation of Planets space.
       -The Bajoran Orb of the Emissary was found there by Captain Benjamin Lafayette Sisko.
Tyrellia: Federation planet with no atmosphere and no magnetic poles.
Tyrus VIIA: Planet where Doctor Farralon tested particle fountain mining.
Tzenketh: -Planet.
          -Homeworld to the Tzenkethi civilization.