T association
T Tauri
T Tauri star
tachyon
TacTix
Tadpole Galaxy
taenite
Taifun
Tait, Peter Guthrie (1831-1901)
Tait's conjecture
Taiyo
Taiyuan Satellite Launch Center (TSLC)
takeoff mass
talc
tally
Tanegashima Space Center
tangent
tangential acceleration
tangle
tangled graph
Tangloids
Tangrams
tank
tankage
tannin
Tansei
tantalum
Tarantula Nebula (NGC 2070, 30 Doradus)
TARDIS
tardyon
target stars
targeted search
Targeted Search System
Tarry, Gaston (1843-1913)
tarsal
Tarski, Alfred (1902-1983)
Tartaglia, Niccoló Fontana (1499-1557)
tartaric acid
Tarter, Jill Cornell (1944-)
Task Group on Sample Return from Small Solar System Bodies
TAU (Thousand Astronomical Unit probe)
tau Bootis
tau Ceti
tau lepton
Taurus (constellation)
Taurus (rocket)
Taurus Moving Cluster
tautochrone problem
tautology
taxon
taxonomy
T-class asteroid
TDRSS (Tracking and Data Relay Satellite System)
Team Encounter
Tebbutt, Comet (C/1861 J1)
technetium star
Technical Intelligence Division (TID)
technological developments, influence on extraterrestrial speculation
tectonic
tectonism
teeth
Teilhard de Chardin, Pierre (1881-1955)
tektite
Teledesic
telemetry
teleology
telepathic species
teleportation
telescope
TELESCOPE EQUIPMENT AND TECHNIQUES
telescope mounting
Telescopium (constellation)
Telesto
telluric lines
telomerase
telomere
telophase
Telstar
Tempel, (Ernst) Wilhelm (Leberecht) (1821-1889)
Tempel 1, Comet 9P/
Tempel-Tuttle, Comet 55P/
temperature
temperature minimum
TEMPEST
temporal lobe lability
ten
tendon
Teng Mu
Tenma
tensile strength
tensor
tentacles
Teodorani, Massimo
tephra
Tereshkova, Valentina Vladimirovna (1937-)
terminal guidance
termination shock
terminal velocity
terminator
Terra
terracing
terraforming
terrestrial age
terrestrial planet
Terrestrial Planet Finder
TERRIERS (Tomographic Experiment using Radiative Recombinative Ionospheric EUV and Radio Sources)
tertiary structure
tesla (T)
Tesla, Nikola (1856-1943)
tesseract
testes
tether
Tethys
tetrahedral number
tetrahedron
tetralogy of Fallot
tetrapod
Tetris
tetromino
Thackaray's globules
Thagard, Norman E. (1943-)
thalamus
Thalassa
thalassemia
Thales of Miletus (c.624-545 BC)
Tharsis Montes
Thebe
Themis
THEMIS (Time History of Events and Macroscale Interaction during Substorms)
Themis family
Themisto
theorem
theory of everything
theory of evolution
theory of relativity
thermal barrier
thermal conduction
thermal conductor
thermal insulator
thermal load
thermal neutron
thermal probe
thermal proteins
thermal radiation
thermal reactor
thermal resistance
thermionic
thermocouple
thermodynamics
thermonuclear reaction
thermophiles
thermosphere
Theseus and the Minotaur
thiamine
Thiel, Walter (1910-1943)
Thiery figure
thigmotropism
The Thing
thirteen
Thirty Colored Cubs puzzle
Thirty-six Officers problem
This Island Earth
tholin
Thollon, Louis (1829-1887)
Thompson, D’Arcy Wentworth (1860-1948)
Thomson, William (Lord Kelvin) (1824-1907)
Thomson effect
Thomson scattering
Thor
THOR (Tracing Habitability, Organics, and Resources)
thoracentesis
thoracic duct
thorax
thorium
Thor's Helmet Nebula (NGC 2359)
thousand
Thousand Astronomical Unit probe (TAU)
three
Three Men's Morris
three-axis stabilization
three-body problem
thrombin
thrombocyte
thrombocytopenia
thrombotic thrombocytopenic purpura
thrust
thrust chamber
thrust commit
thrust decay
thrust equalizer
thrust fault
thrust generator
thrust misalignment
thrust vector control
thrust-to-Earth-weight ratio
thruster
Thuban (Alpha Draconis)
Thue-Morse constant
Thule (minor planet 279)
thymine
thymosin
thymus gland
thyroglobulin
thyroid cancer
thyroid cancer treatment
thyroid gland
thyroid hormone
thyroid-stimulating hormone (thyrotropin)
thyrotropin-releasing hormone (TRH)
thyroxine
tibia
tic-tac-toe
TID
tidal dwarf galaxy
tidal force
tidal heating
tidal lock
tidal radius
tidal tail
tide
tie knots
Tikhonravov, Mikhail K. (1901-1974)
Tikov, Gavriil Adrianovich (1875-1960)
tiling
Tiling, Reinhold (1890-1933)
Timation
time
time complexity
time dilation
time dislocation
time machine
time measurement
time portal
time reversal
time travel
TIMED (Thermosphere Ionosphere Mesosphere Energetic Dynamics satellite
time-division multiplexing
time-reversible
tin
Tinner's Rabbits
tinnitus (ringing in the ear)
TiO bands
Tipler, Frank J.
Tipler's Argument
Tippee Top
TiPS (Tether Physics and Survivability satellite)
Tipu Sultan (c.1750-1799)
TIROS (Television Infrared Observation System)
tissue
Titan
Titan, prebiotic evolution
Titan, seas and lakes
Titan (rocket)
Titania
Titchener illusion
Titius-Bode Law
Tito, Dennis (1941-)
Titov, Gherman Stepanovich (1935-)
Titov, Vladimir Georgievich (1947-)
TLP (transient lunar phenomena)
T-lymphocyte
TMR-1C
Toby Jug Nebula (IC 2220)
Todd, David P. (1855-1939)
Toeplitz matrix
Toftoy, Holger N. (1903-1967)
tokamak
Tombaugh, Clyde William (1906-1997)
TOMS (Total Ozone Mapping Spectrometer)
tongue
TOPEX-Poseidon
topocentric coordinates
topography
topological dimension
topological group
topological space
TOPOLOGY
topology
toric contact lenses
Torino scale
torque
Toro (minor planet 1685)
torus
TOS (TIROS Operational System)
total eclipse
total impulse
total internal reflection
totality
touchdown
Tough, Allen
tour
Tournesol
Toutatis (minor planet 4179)
Tower of Brahma
Tower of Hanoi
Townes, Charles Hard (1915-)
TPF
T-puzzle
TRACE (Transition Region and Coronal Explorer)
trace (mathematics)
trace element
trachea
tracheid
tracking
tractor beam
tractrix
trailing hemisphere
trajectory
transcendental number
transcription
transducer
transduction
transfer ellipse
transfer function
transfer lens
transfer RNA
transfinite number
transformation
transgenic
TransHab
transient ischemic attack
transient lunar phenomena
transit
transit circle
Transit satellites
transition region
transition variable
translation
translational thrust
translatory motion
translocation
translunar
transmigration of souls
transmitter
trans-Neptunian object
transpiration
transonic
transporter (Star Trek)
transpose
transposition cipher
transonic
transponder
transuranic element
transversal
transverse acceleration
transverse velocity
transverse wave
Trapezium (in Orion)
trapezium (shape)
trapezoid
trapped propellant
traveling salesman problem
tree
trefoil curve
Triana
triangle
Triangular Lodge
triangular number
Triangulum (constellation)
Triangulum Australe (constellation)
Triangulum Galaxy (M33, NGC 598)
Triassic period
triboluminescence
triceps
Trick Donkeys
trident of Newton
Trifid Nebula (M20, NGC 6514)
trigeminal nerve
triglyceride
trigonometric function
trigonometry
triiodothyronine
trillion
trinomial
triomino
triple point
triple-alpha process
triplet
tripoblastic
trisecting an angle
trisectrix
trisomy
tritium
Triton
TRMM (Tropical Rainfall Measuring Mission)
tRNA
trochlear nerve
trochoid
troctolite
troilite
Troitskii, Vsevolod Sergeevich (1913-)
Trojan (asteroid)
Troland, Leonard (1889-1932)
trophic level
tropic
tropopause
troposphere
Truax, Robert C.
True of Date (TOD)
true pole
truel
Truly, Richard H. (1937-)
Trumpet
Trumpler, Robert Julius (1886-1956)
Trumpler classification
truncatable prime
truncate
trypsin
tryptophan
Tsander, Fridrikh Arturovitch (1887-1933)
Tschirnaus's cubis
Tselina
Tsien, Hsue-Shen (1909-)
Tsikada
Tsiolkovsky, Konstantin Eduardovich (1857-1935)
tsunami
Tsyklon
TSS (Tethered Satellite System)
tubulin
Tucana (constellation)
47 Tucanae (NGC 104)
Tucker, George (1775-1861)
Tully-Fisher relation
tumor
tumor suppressor gene
tungsten
Tunguska phenomenon
tunneling
Tupolev, Andrei (1888-1972)
turbofan engine
turbojet engine
turboprop engine
turbopump
Turing, Alan Mathison (1912-1954)
Turing machine
Turing test
Turing machine
Turnbull, Margaret C.
Turner, Herbert Hall (1861-1930)
turnoff point
twenty
21-centimeter line
twelve
twilight
twin primes
Twining, Lieutenant-General Nathan F. (1897-1982)
Twinkle, Project
TWINS (Two-wide Angle Imaging Neutral-atom Spectrometer)
Twins Paradox
twisted cubic
two
2001: A Space Odyssey
2003 EL61
2003 UB313 (Eris)
2004 DW (Kuiper Belt object)
2004 VD17
2004 XP14
2M1207
two-body problem
two-dimensional worlds
two-stage-to-orbit (TSTO)
Tycho Brahe (1546-1601)
Tycho Catalogue
Tycho crater (Moon)
Tycho’s Star
Tyndall, John (1820-1893)
type metal
tyrosine
Tyuratam