Term Index (T)
- T:
- T-type star (T): type of dwarf with a temperature in the vicinity of 1000K
- tesla (T): unit of magnetic flux density
- timescale (t,τ): general length of time something takes
- T dwarf:
- brown dwarf (BD): star-like object with less mass than a star
- T-type star (T): type of dwarf with a temperature in the vicinity of 1000K
- T Tau:
- T Tauri: variable star taken as example of young star
- T Tau N:
- T Tauri: variable star taken as example of young star
- T Tau Sa:
- T Tauri: variable star taken as example of young star
- T Tau Sb:
- T Tauri: variable star taken as example of young star
- T Tauri: variable star taken as example of young star
- TŻO:
- T-class:
- T-type star (T): type of dwarf with a temperature in the vicinity of 1000K
- T-class star:
- T-type star (T): type of dwarf with a temperature in the vicinity of 1000K
- T-ReCS:
- T-Tauri star (TTS): type of variable pre-main-sequence star
- T-type star (T): type of dwarf with a temperature in the vicinity of 1000K
- t0:
- Lambda-CDM model (ΛCDM,LCDM): Big-Bang cosmological model with a cosmological constant and cold dark matter
- seeing: apparent blurring and twinkling of objects seen through atmosphere
- TBB:
- Teff:
- Teph:
- time standard: method of designating points in time and quantifying time periods
- Teq:
- TVir:
- virial theorem: average kinetic energy equals half the average negative potential energy
- Tabby's Star:
- TAIPAN: multi-object spectrograph with robot fiber-positioner
- Taipan Galaxy Survey:
- TAIPAN: multi-object spectrograph with robot fiber-positioner
- Taiwan:
- TAM: non-gray-RT 3D model of Titan's atmosphere
- tangential velocity:
- TAO:
- TAP:
- task:
- task-based parallelism (TBP): breaking a computation into tasks that can be run in parallel
- tau:
- tau neutrino:
- Tauras A:
- Taurus Auriga Perseus Complex:
- Taurus Dark Clouds:
- Taurus Molecular Cloud:
- HL Tau: much-studied T-Tauri star
- Taurus Molecular Cloud 1 (TMC-1): nearby star-forming region
- Taurus Molecular Cloud 2:
- Taurus-Auriga Complex: nearby star-forming region
- Taurus-Auriga Region:
- Taurus-Auriga SFR:
- Taylor column:
- Taylor series:
- Taylor series expansion:
- Taylor-Proudman theorem: theorem regarding movement through a rotating fluid
- TB:
- TBL:
- TBP:
- TCB:
- time standard: method of designating points in time and quantifying time periods
- TD:
- time standard: method of designating points in time and quantifying time periods
- TDB:
- time standard: method of designating points in time and quantifying time periods
- TDE:
- TDF:
- TDT:
- time standard: method of designating points in time and quantifying time periods
- TE:
- technique:
- technology:
- duty cycle: percent of time when activity is recurring
- TECP:
- Phoenix: Mars probe launched by NASA in 2007 with lander
- tectonic activity:
- Teff:
- TEGA:
- Phoenix: Mars probe launched by NASA in 2007 with lander
- Teide Observatory:
- telegrapher's equations: two equations describing a transmission line
- telescope: instrument to observe at a distance
- Telescope Nazionale Galileo:
- HARPS-N: high-precision spectrograph for exoplanet searches in Canary Islands
- telescope type:
- telescopes:
- Telescopio Nazionale Galileo (TNG): 3.58m telescope in Canary Islands
- telluric:
- telluric contamination:
- telluric contamination.:
- telluric line:
- telluric planet:
- telluric standard star:
- telluric star: star of known spectrum used for calibration
- Tempel 1:
- EPOXI: mission using Deep Impact for further exploration
- Stardust: space mission to collect comet coma dust
- temperature: measure of heat in matter
- temperature gradient:
- temperature inversion:
- temperature profile:
- temperature scale height:
- Tempo:
- Tempo2:
- temps dynamique barycentrique:
- time standard: method of designating points in time and quantifying time periods
- temps-coordonnée barycentrique:
- time standard: method of designating points in time and quantifying time periods
- Tenegra observatory:
- Teq:
- terminator: line between regions of day and night
- terminology:
- dex: a number or factor's log base 10
- in situ: on site
- terrestrial dynamical time:
- time standard: method of designating points in time and quantifying time periods
- terrestrial planet:
- Terrestrial Planet Finder (TPF): plan for space telescopes to find smaller exoplanets
- terrestrial time (TT): current measure of time for astronomical observations on Earth
- time standard: method of designating points in time and quantifying time periods
- tertiary mirror:
- TES:
- TES bolometer:
- TES Camera:
- TESCAM:
- tesla (T): unit of magnetic flux density
- TESS:
- TESS Follow-up Observing Program:
- TESS object of interest:
- Tethys:
- moon: a planet's natural satellite, such as Earth's
- Saturn: second largest planet in the solar system
- Texas:
- Texas Interferometer:
- Texas Survey of Radio Sources at 365 MHz (TXS): 1970s/1970s radio survey made with the Texas Interferometer
- texture:
- TFOP:
- TFR:
- TGE:
- TGI:
- QUIJOTE: survey to measure the polarization of the CMB
- THA:
- THA star:
- The Arecibo Legacy Fast ALFA Survey:
- ALFALFA: HI survey of many galaxies
- The Colossus Telescope:
- The H2O Southern Galactic Plane Survey (HOPS): survey of molecular clouds in the galactic plane
- The LaSilla-QUEST Variability Survey:
- QUEST: sixteen square-degree survey camera
- Theia:
- THEMIS: set of satellites studying the Earth's magnetic field
- theory:
- Theory of Everything (TOE): single law explaining the four forces of nature
- symmetry breaking: loss of symmetry, such as due to loss of stability in a regime change
- thermal broadening:
- thermal Doppler broadening:
- thermal emission:
- thermal energy:
- thermal escape:
- thermal inertia: a measure of a material's ability to absorb heat through conduction
- thermal IR:
- infrared (IR): electromagnetic radiation, wavelength .74-300 micrometers
- thermal noise: noise inherent in electronic component warmer than absolute zero
- photon noise: variation in light measurement due to its quantum nature
- thermal pulse: pulse in an AGB star due to helium fusion in a shell
- thermal radiation:
- thermal Sunyaev-Zel'dovich effect:
- thermal tide:
- thermal timescale:
- thermal wind: wind from pressure and the Coriolis force varying with altitude
- thermal wind balance:
- thermal wind: wind from pressure and the Coriolis force varying with altitude
- thermodynamic equilibrium (TE): state of a system with no net heat flows
- thermodynamics: physics of heat and energy
- thermoelectric effect:
- MMRTG: power source for space probes
- thermonuclear supernova:
- thermosphere:
- Theta Orionis:
- thick disk:
- thick disk stars:
- thin disk:
- thin disk accretion:
- thin disk stars:
- think disk:
- Third Cambridge Catalogue of Radio Sources (3C): 1959 catalog of northern hemisphere 159MHz sources
- Third Catalogue of Nearby Stars:
- third-order coma:
- Thirty Meter Telescope (TMT): extremely large telescope planned for Hawaii
- Thomson optical depth: a measure of affects of Thomson scattering
- Thomson scattering: elastic scattering of photons by a charged particle
- Thomson thick:
- thorium:
- Thorne-Żytkow object (TZO,TŻO): giant star with a neutron star at its center
- three dimensional model: computer simulation handling variation in all three dimensions
- three-body capture:
- tidal capture: bodies entering orbit through dissipation of energy by tides
- three-body problem:
- N-body problem: calculating the paths of gravitationally-interacting celestial objects
- three-mirror anastigmat: type of reflecting telescope
- tidal:
- galactic tide: effect of one galaxy's gravity, such as on another galaxy
- Love number: measures of rigidity of a body
- Roche limit: nearest a body can orbit another and survive
- tidal arm: arm of gas and potentially stars leading from a galaxy
- tidal disruption event (TDE,TDF): star pulled apart by black hole tidal forces
- tidal force: affect of a third body on the gravitational force between two bodies
- tidal heating: heating due to friction from motions caused by tidal force
- tidal locking: locked rotation of an orbiting body
- tidal tail: string of mass ejected by a tidal forces in a neutron star merger
- tidal acceleration:
- tidal force: affect of a third body on the gravitational force between two bodies
- tidal arm: arm of gas and potentially stars leading from a galaxy
- tidal braking:
- tidal force: affect of a third body on the gravitational force between two bodies
- tidal capture: bodies entering orbit through dissipation of energy by tides
- tidal deceleration:
- tidal force: affect of a third body on the gravitational force between two bodies
- tidal disruption event (TDE,TDF): star pulled apart by black hole tidal forces
- tidal disruption flare:
- tidal equilibrium:
- tidal force: affect of a third body on the gravitational force between two bodies
- tidal flexing:
- tidal heating: heating due to friction from motions caused by tidal force
- tidal force: affect of a third body on the gravitational force between two bodies
- tidal heating: heating due to friction from motions caused by tidal force
- tidal locking: locked rotation of an orbiting body
- tidal potential:
- tide: affect of Moon's gravity on Earth's seas, etc.
- tidal Q factor:
- Q factor: measure of oscillator's damping
- tidal quality factor:
- Q factor: measure of oscillator's damping
- tidal radius:
- Hill radius: radius of gravitational influence of a body
- tidal stream:
- tidal arm: arm of gas and potentially stars leading from a galaxy
- tidal stripping:
- tidal arm: arm of gas and potentially stars leading from a galaxy
- tidal tail: string of mass ejected by a tidal forces in a neutron star merger
- tidal arm: arm of gas and potentially stars leading from a galaxy
- tidal theory:
- tidal working:
- tidal heating: heating due to friction from motions caused by tidal force
- tidal-capture binary:
- binary star: system of two stars co-orbiting
- tidal capture: bodies entering orbit through dissipation of energy by tides
- tidal-tail galaxy:
- tidal arm: arm of gas and potentially stars leading from a galaxy
- tide: affect of Moon's gravity on Earth's seas, etc.
- tiger stripes:
- Enceladus: Saturn moon considered possible carrier of life
- Tillinghast:
- Tillotson EoS:
- Tillotson equation: equation of state for high speed impacts
- Tillotson equation of state:
- tilt:
- obliquity: angle between an object's rotational and orbital axes
- tilt erosion:
- obliquity: angle between an object's rotational and orbital axes
- TIME:
- time dilation: relativity's ability to make time longer
- Time History of Events and Macroscale Interactions during Substorms:
- THEMIS: set of satellites studying the Earth's magnetic field
- time scale:
- time standard: method of designating points in time and quantifying time periods
- timescale (t,τ): general length of time something takes
- time series:
- time series analysis: analysis of data points collected uniformly separated times
- time standard: method of designating points in time and quantifying time periods
- time system:
- time standard: method of designating points in time and quantifying time periods
- time-like:
- geodesic: equivalent to a straight line in curved space
- spacetime diagram: graph of simplified spacetime, with fewer space dimensions
- time-of-flight spectrometer:
- TIME-pilot:
- timescale (t,τ): general length of time something takes
- timing:
- timing noise:
- TiNy Titans (TNT): study of dwarf galaxy pairs
- Titan: well-known Saturn moon
- Cassini: explorer spaceship sent to Saturn
- Dragonfly: plan for Titan flying rover
- moon: a planet's natural satellite, such as Earth's
- Saturn: second largest planet in the solar system
- Titan Atmospheric Model:
- TAM: non-gray-RT 3D model of Titan's atmosphere
- Titania:
- moon: a planet's natural satellite, such as Earth's
- Uranus: second outer-most solar system planet
- Titius-Bode law: relationship between the distances between solar system planets
- Titius-Bode rule:
- Titius-Bode law: relationship between the distances between solar system planets
- titrant:
- titration: analyzing a chemical solution by color change
- titration: analyzing a chemical solution by color change
- titrimetry:
- titration: analyzing a chemical solution by color change
- TL:
- MMX: Japanese probe to bring back a sample of a Martian moon
- TLF:
- TMC-1:
- TMC-2:
- TMT:
- TN:
- TNG:
- TNO:
- TNS:
- TNT:
- TO:
- turn-off point (TO): point in H-R diagram of a cluster where stars turn red
- TOE:
- TOI:
- Tokyo Atacama Observatory:
- Tolman-Oppenheimer-Volkoff limit (TOV,LOV): maximum mass of a neutron star
- TolTEC: Sensitive infrared camera under construction for the LMT
- TolTEC C2C:
- TolTEC: Sensitive infrared camera under construction for the LMT
- TolTEC FiF:
- TolTEC: Sensitive infrared camera under construction for the LMT
- TolTEC LSS:
- TolTEC: Sensitive infrared camera under construction for the LMT
- TolTEC UD:
- TolTEC: Sensitive infrared camera under construction for the LMT
- Tomographic Ionized-carbon Mapping Experiment (TIME): proposed instrument to map the [CII] line
- tomography:
- Ton:
- Tonantzintla Observatory:
- Tonantzintla Surveys (Ton): surveys providing early images of quasars and Seyfert galaxies
- Toomre Q parameter (Q): stability criterion for differentially rotating disks
- Toomre's stability criteria:
- top quark:
- topological defect: defect in space that could arise in the early universe
- toroidal:
- tortuosity: describes something curved with many twists and turns
- torus:
- torus coordinates: coordinates for toruses
- total derivative:
- total differential equation:
- total energy:
- total mass:
- total relativistic energy:
- TOURNESOL:
- GRANAT: observatory-satellite for detecting gamma rays and X-rays
- TOV:
- TPF:
- TRACE: former solar observing satellite
- tracer: chemical whose presence indicates the presence of another chemical
- trade winds:
- Trans-Atlantic Exoplanet Survey (TrES): exoplanet-search survey using three telescopes
- trans-iron element: elements with atomic number greater than that of iron
- trans-Neptune object:
- trans-Neptunian object (TNO): minor planet beyond Neptune
- transfer equation:
- transformation group:
- transient: observed change in the sky
- GW170817: gravitational wave detection from a neutron star merger
- SN 1987A (1987A): supernova in February 1987 rare for being visible by the naked eye
- SN 2014J: type Ia supernova in Messier 82, the Cigar Galaxy
- transient astronomical event:
- transient astronomy: study of short-term astronomical phenomena
- Transient Name Server (TNS): online catalog of transients
- transient type:
- transients:
- transit: a celestial body passing between another and an observer
- occultation: one celestial body hiding another from an observer
- transit mapping:
- transit method:
- transit radio telescope:
- transit spectroscopy: spectroscopy through an exoplanet's transit
- transit telescope: telescope able to shift aim up/down but not horizontally
- transit timing variations (TTV): variations in the timing of the transits of exoplanets and binaries
- Transiting Exoplanet Survey Satellite (TESS): observatory-satellite searching for transiting exoplanets
- transiting planet: planet crossing between another body and the observer
- Transiting Planets and Planetesimals Small Telescope:
- TRAPPIST: ground-based automatic transiting planet finding telescope
- transition disk:
- transition edge sensor (TES): sensor using superconductor's strong resistance sensitivity
- transition edge sensor bolometer:
- transition region:
- Transition Region and Coronal Explorer:
- TRACE: former solar observing satellite
- transitional disk: disk with inner part cleared
- transitional planet:
- super-Earth: exoplanet more massive than Earth but substantially less than Neptune
- transits:
- transmission spectroscopy: spectrum of radiation passing through a substance
- transverse velocity:
- Trapezium Cluster: open cluster of stars in Orion Nebula
- TRAPPIST: ground-based automatic transiting planet finding telescope
- TRAPPIST-1: red dwarf with exoplanet near the habitable zone
- Traverse Gravimeter Experiment:
- TRC:
- Hipparcos: ESA astrometry space observatory circa 1990
- tree:
- dendrogram: diagram of a "tree", i.e., of a graph without cycles
- tremendously low frequency (TLF): electromagnetic radiation, frequency below 3Hz
- TrES:
- Tri II:
- Triangulum Galaxy (M33): small spiral galaxy in the Local Group
- Triangulum II (Tri II): dwarf galaxy in the Local Group
- triaxial galaxy:
- galaxy: gravitationally-bound group of stars
- triple alpha process: fusion reaction chain turning helium-4 into carbon
- triple bond:
- hydrocarbon (HC): any compound of just carbon and hydrogen
- triple point:
- Mars: well-explored planet in the solar system
- triple prism spectrograph:
- spectroscopy: measurement of the strengths of different electromagnetic wavelengths
- triple system:
- TripleSpec (TSpec): near-infrared spectrograph on the Hale Telescope
- Triton: Neptune's one significant moon
- irregular moon: moon with an atypical orbit, such as retrograde
- moon: a planet's natural satellite, such as Earth's
- Moon formation: process by which the Moon and other moons formed
- Neptune: outer-most solar system planet
- Trojan:
- Trojan asteroid:
- Trojan point:
- tropopause:
- troposphere:
- true anomaly:
- true vacuum:
- Tsol:
- Titan: well-known Saturn moon
- TSpec:
- TripleSpec (TSpec): near-infrared spectrograph on the Hale Telescope
- tsunami:
- tSZ:
- tSZE:
- TT:
- CMB polarization: effects of scattering and lensing on the CMB
- terrestrial time (TT): current measure of time for astronomical observations on Earth
- time standard: method of designating points in time and quantifying time periods
- TTS:
- TTV:
- Tubingen Ultraviolet Echelle Spectrometer (TUES): 1990s UV spectrometer used on two Space Shuttle missions
- Tucana Horologium association (THA): nearby stellar association
- TUES:
- Tully-Fisher relation (TFR): relation between spiral galaxy luminosity and line width
- tunnel diode:
- tunneling:
- turbulence: irregular flow of a fluid
- turbulence pressure:
- turbulent flow:
- turbulent pressure: pressure component due to the presence of turbulence
- turn-off:
- turn-off point (TO): point in H-R diagram of a cluster where stars turn red
- turn-off point (TO): point in H-R diagram of a cluster where stars turn red
- Turtlebeach: radiative transfer code
- TW Hya:
- TW Hydrae (TW Hya): nearest T-Tauri star
- TW Hydrae association (TWA): nearby stellar association
- TWA:
- TWA star:
- twinkling:
- two dimensional model:
- Two Micron All-sky Survey (2MASS): near-infrared survey of both hemispheres
- two-body problem:
- N-body problem: calculating the paths of gravitationally-interacting celestial objects
- two-photon emission:
- two-stream approximation: approximation of a star's internal EMR's divergence from isotropic
- TXS:
- TYC:
- Hipparcos: ESA astrometry space observatory circa 1990
- Tycho Catalog:
- Hipparcos: ESA astrometry space observatory circa 1990
- Tycho Reference Catalog:
- Hipparcos: ESA astrometry space observatory circa 1990
- Tycho-1 Catalog:
- Hipparcos: ESA astrometry space observatory circa 1990
- Tycho-2 Catalog:
- Hipparcos: ESA astrometry space observatory circa 1990
- Type A CAI:
- CAI: calcium/aluminum specs in chondrites
- Type B CAI:
- CAI: calcium/aluminum specs in chondrites
- Type C CAI:
- CAI: calcium/aluminum specs in chondrites
- Type I:
- Type I Cepheid:
- Type I migration:
- Type I SLSN:
- Type I supernova:
- supernova (SN): stellar explosion larger than a nova
- Type Ia supernova: type of supernova for which distance can be determined
- Type Ic supernova:
- Type II:
- Type II Cepheid:
- Type II migration:
- Type II SLSN:
- Type II supernova:
- Type III:
- Type III migration:
- Type IIn supernova:
- Type IV:
- Type V:
- Type VI:
- TZO:
index