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Syncom 3
Syncom 3 was an experimental communications satellite built by Hughes Aircraft for NASA and launched in 1964, the first placed in a true geostationary orbit, relaying the Tokyo Olympics live.
TacSat
TacSat, short for Tactical Satellite, is a series of small experimental US military satellites from the mid-2000s demonstrating quick, low-cost spacecraft under commanders' direct control.
Taiji (spacecraft)
Taiji-1 (太极一号) is a Chinese experimental satellite launched on 31 August 2019 to test key technologies for space-based gravitational wave detection, the first spacecraft of the Chinese Academy of Sciences' Taiji program.
Taiyuan Satellite Launch Center (太原卫星发射中心)
Taiyuan Satellite Launch Center (太原卫星发射中心) is a Chinese orbital launch facility in Kelan County, Shanxi, operated by the PLA Aerospace Force and China's main site for sun-synchronous and polar launches.
Tanegashima Space Center (種子島宇宙センター)
Tanegashima Space Center (種子島宇宙センター) is JAXA's rocket launch site on Tanegashima Island in Kagoshima Prefecture, Japan, and the country's largest launch complex, founded in 1969.
Teacher in Space Project
The Teacher in Space Project, announced by Reagan in 1984, was a NASA program to fly a schoolteacher aboard the Shuttle; Christa McAuliffe died on Challenger in 1986.
Telesat
Telesat is a Canadian satellite operator headquartered in Ottawa, founded in 1969 and known for launching Anik A1, the world's first domestic commercial geostationary communications satellite.
Telespazio
Telespazio is an Italian satellite services company headquartered in Rome, founded in 1961, jointly owned by Leonardo and Thales, and operating the Fucino Space Centre.
Television receive-only
Television receive-only (TVRO) is a satellite earth station that receives television signals but never transmits, ranging from large 1980s C-band home dishes to professional antennas.
Telkom 3S
Telkom 3S is a geostationary communications satellite owned by Indonesia's PT Telkom Indonesia, built by Thales Alenia Space and launched in February 2017 into the 118° East slot.
Telkomsat
Telkomsat (PT Telkom Satelit Indonesia) is an Indonesian satellite service provider, a Telkom Indonesia subsidiary formed in 2018, operating five satellites including Telkom-3S and Merah Putih.
Telstar
Telstar was the name of two experimental communications satellites built by AT&T's Bell Laboratories and launched by NASA, the first relaying live transatlantic television in 1962.
Terrain-relative navigation
Terrain-relative navigation (TRN) is a navigation technique in which a vehicle matches sensor views of the terrain below it against a preloaded map to determine its position.
Terran Orbital
Terran Orbital is an American small satellite manufacturer founded in 2013, headquartered in Boca Raton, Florida, and known for building the CAPSTONE lunar CubeSat; Lockheed Martin acquired it in 2024.
Thales Alenia Space
Thales Alenia Space, formerly Alcatel Alenia Space, is a French-Italian aerospace company, a joint venture of Thales and Leonardo founded in 2007 that builds satellites and space station modules.
The Aerospace Corporation
The Aerospace Corporation is an American nonprofit, incorporated in California in 1960, that operates the only federally funded research center dedicated exclusively to space, supporting the U.S. Space Force.
The Dream Is Alive
The Dream Is Alive (1985) is a 37-minute IMAX documentary about the Space Shuttle, shot in space by 14 NASA astronauts on three 1984 missions, directed by Graeme Ferguson and narrated by Walter Cronkite.
The Last Starfighter
The Last Starfighter is a 1984 Nick Castle sci-fi film, also known as a pioneering CGI movie, in which arcade gamer Alex Rogan is recruited by Centauri (Robert Preston's final role) to fight the Ko-Dan Armada.
The Planetary Society
The Planetary Society is an American nonprofit founded in 1980 by Carl Sagan and colleagues to advocate for space exploration, known for the LightSail 2 solar sailing spacecraft.
The Right Stuff (TV series)
The Right Stuff is a 2020 American historical drama series on Disney+ and National Geographic, based on Tom Wolfe's 1979 book about NASA's Mercury Seven astronauts, running eight episodes.
THEMIS
THEMIS (Time History of Events and Macroscale Interactions during Substorms) is a NASA five-satellite mission launched in 2007 that identified magnetic reconnection as the trigger of auroral substorms.
Thiokol
Thiokol, also known as Morton Thiokol or Thiokol Chemical Corporation, was an American company founded in 1929, first commercial producer of synthetic rubber in the United States and maker of the Space Shuttle boosters.
Third-party evidence for Apollo Moon landings
Third-party evidence for the Apollo Moon landings (1969–1972) includes lunar samples studied worldwide, laser ranging to retroreflectors, and photos of landing sites by India, Japan, and China.
Thomas L. Hampton
Thomas L. Hampton, also known as Thomas Lee Hampton, was an American aircraft-engine structural designer and executive elected to the National Academy of Engineering in 1997 for large aircraft engine design.
Thor Ablestar
Thor Ablestar, also written Thor-Able-Star and known as Thor-Epsilon, was an American two-stage Air Force launch vehicle that launched the first Transit navigation satellites between 1960 and 1965, flying 19 times.
Thor Agena A
The Thor Agena A was an American two-stage launch vehicle, a Thor missile with an Agena A upper stage, used from 1959 to 1960 to launch Corona reconnaissance satellites.
Thor Agena B
The Thor Agena B was an American two-stage expendable launch vehicle combining a Thor missile first stage with a restartable Agena B upper stage, used from 1960 to 1966.
Thor SLV-2A Agena D
The Thor SLV-2A Agena D was an American expendable launch vehicle combining a Thrust Augmented Thor first stage with a Lockheed Agena D upper stage, flying from 1963 to 1968.
Thorad SLV-2G Agena D
Thorad SLV-2G Agena D was an American two-stage expendable launch vehicle flown by the US Air Force from Vandenberg, chiefly for Corona reconnaissance satellites, from 1966 to 1972.
Three-body problem
The three-body problem, or problem of three bodies, asks how three masses move under mutual Newtonian gravity; it has no general solution and is chaotic.