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Explorers Program

Index Explorers Program

The Explorers program is a NASA exploration program that provides flight opportunities for physics, geophysics, heliophysics, and astrophysics investigations from space. [1]

Table of Contents

  1. 197 relations: Advanced Composition Explorer, Aeronomy of Ice in the Mesosphere, AMPTE-CCE, Apollo program, Applied Physics Laboratory, Ariane 5, ARIEL, Astrophysics, Atlas V, Atmospheric science, Atmospheric Waves Experiment, Blok D, C/NOFS, CHIPS (satellite), CINDI, Compton Spectrometer and Imager, Contribution to ARIEL Spectroscopy of Exoplanets, Cosmic Background Explorer, Cosmic Vision, Delta (rocket family), Delta 1000, Delta 2000, Delta A, Delta B, Delta C, Delta E, Delta II, Delta IV, Delta J, Delta M, Discovery Program, Dual Air Density Explorer, Dynamics Explorer 1, Dynamics Explorer 2, Earth, Earth trojan, Electronics, European Space Agency, Explorer 1, Explorer 10, Explorer 11, Explorer 12, Explorer 14, Explorer 17, Explorer 18, Explorer 19, Explorer 2, Explorer 26, Explorer 27, Explorer 29, ... Expand index (147 more) »

Advanced Composition Explorer

Advanced Composition Explorer (ACE or Explorer 71) is a NASA Explorer program satellite and space exploration mission to study matter comprising energetic particles from the solar wind, the interplanetary medium, and other sources.

See Explorers Program and Advanced Composition Explorer

Aeronomy of Ice in the Mesosphere

The Aeronomy of Ice in the Mesosphere (AIM or Explorer 90) is a NASA satellite launched in 2007 to conduct a planned 26-month study of noctilucent clouds (NLCs).

See Explorers Program and Aeronomy of Ice in the Mesosphere

AMPTE-CCE

AMPTE-Charge Composition Explorer, also called as AMPTE-CCE or Explorer 65, was a NASA satellite designed and tasked to study the magnetosphere of Earth, being launched as part of the Explorer program.

See Explorers Program and AMPTE-CCE

Apollo program

The Apollo program, also known as Project Apollo, was the United States human spaceflight program carried out by the National Aeronautics and Space Administration (NASA), which succeeded in preparing and landing the first men on the Moon from 1968 to 1972. Explorers Program and Apollo program are NASA programs.

See Explorers Program and Apollo program

Applied Physics Laboratory

The Johns Hopkins University Applied Physics Laboratory (or simply Applied Physics Laboratory, or APL) is a not-for-profit university-affiliated research center (UARC) in Howard County, Maryland.

See Explorers Program and Applied Physics Laboratory

Ariane 5

Ariane 5 is a retired European heavy-lift space launch vehicle developed and operated by Arianespace for the European Space Agency (ESA).

See Explorers Program and Ariane 5

ARIEL

The Atmospheric Remote-sensing Infrared Exoplanet Large-survey (ARIEL) is a space telescope and the fourth medium-class mission of the European Space Agency's Cosmic Vision programme.

See Explorers Program and ARIEL

Astrophysics

Astrophysics is a science that employs the methods and principles of physics and chemistry in the study of astronomical objects and phenomena.

See Explorers Program and Astrophysics

Atlas V

Atlas V is an expendable launch system and the fifth major version in the Atlas launch vehicle family.

See Explorers Program and Atlas V

Atmospheric science

Atmospheric science is the study of the Earth's atmosphere and its various inner-working physical processes.

See Explorers Program and Atmospheric science

Atmospheric Waves Experiment

The Atmospheric Waves Experiment (AWE) is a NASA instrument to be mounted on the exterior of the International Space Station (ISS) for the study of atmospheric gravity waves (not to be confused with astrophysical gravitational waves).

See Explorers Program and Atmospheric Waves Experiment

Blok D

Blok D (Блок Д meaning Block D) is an upper stage used on Soviet and later Russian expendable launch systems, including the N1, Proton-K and Zenit.

See Explorers Program and Blok D

C/NOFS

C/NOFS, or Communications/Navigation Outage Forecasting System was a USAF satellite developed by the Air Force Research Laboratory (AFRL) Space Vehicles Directorate to investigate and forecast scintillations in the Earth's ionosphere.

See Explorers Program and C/NOFS

CHIPS (satellite)

CHIPS (Cosmic Hot Interstellar Plasma Spectrometer, also Explorer 82 or UNEX-2) was a NASA Explorer program satellite.

See Explorers Program and CHIPS (satellite)

CINDI

CINDI, or the Coupled Ion-Neutral Dynamics Investigation is a NASA mission of opportunity payload aboard the C/NOFS satellite.

See Explorers Program and CINDI

Compton Spectrometer and Imager

The Compton Spectrometer and Imager (COSI) is a NASA SMEX astrophysics mission that will launch a soft gamma-ray telescope (0.2-5 MeV) in 2027.

See Explorers Program and Compton Spectrometer and Imager

Contribution to ARIEL Spectroscopy of Exoplanets

Contribution to ARIEL Spectroscopy of Exoplanets (CASE) is a detector subsystem contribution to an infrared spectrometer instrument for the planned European ARIEL space telescope.

See Explorers Program and Contribution to ARIEL Spectroscopy of Exoplanets

Cosmic Background Explorer

The Cosmic Background Explorer (COBE), also referred to as Explorer 66, was a NASA satellite dedicated to cosmology, which operated from 1989 to 1993.

See Explorers Program and Cosmic Background Explorer

Cosmic Vision

Cosmic Vision is the third campaign of space science and space exploration missions in the Science Programme of the European Space Agency (ESA).

See Explorers Program and Cosmic Vision

Delta (rocket family)

The Delta rocket family was a versatile range of American rocket-powered expendable launch systems that provided space launch capability in the United States from 1960 to 2024.

See Explorers Program and Delta (rocket family)

Delta 1000

The Delta 1000 series (also referred to as Straight-Eight) was an American expendable launch system which was used to conduct eight orbital launches between 1972 and 1975.

See Explorers Program and Delta 1000

Delta 2000

The Delta 2000 series was an American expendable launch system which was used to conduct forty-four orbital launches between 1974 and 1981.

See Explorers Program and Delta 2000

Delta A

The Delta A, or Thor-Delta A was an American expendable launch system used to launch two Explorer spacecraft in October 1962.

See Explorers Program and Delta A

Delta B

The Delta B, or Thor-Delta B was an American expendable launch system used for nine orbital launches between 1962 and 1964.

See Explorers Program and Delta B

Delta C

The Delta C, or Thor-Delta C was an American expendable launch system used for thirteen orbital launches between 1963 and 1969.

See Explorers Program and Delta C

Delta E

The Delta E, or Thor-Delta E was an American expendable launch system used for twenty-three orbital launches between 1965 and 1971.

See Explorers Program and Delta E

Delta II

Delta II was an expendable launch system, originally designed and built by McDonnell Douglas, and sometimes known as the Thorad Delta 1.

See Explorers Program and Delta II

Delta IV

Delta IV was a group of five expendable launch systems in the Delta rocket family.

See Explorers Program and Delta IV

Delta J

The Delta J or Thor-Delta J was an American expendable launch system of the late 1960s.

See Explorers Program and Delta J

Delta M

The Delta M or Thor-Delta M was an American expendable launch system used for thirteen orbital launches between 1968 and 1971.

See Explorers Program and Delta M

Discovery Program

The Discovery Program is a series of Solar System exploration missions funded by the U.S. National Aeronautics and Space Administration (NASA) through its Planetary Missions Program Office. Explorers Program and Discovery Program are NASA programs.

See Explorers Program and Discovery Program

Dual Air Density Explorer

Dual Air Density Explorer was a set of 2 satellites, DADE-A and DADE-B, released as part of NASA's Explorer program.

See Explorers Program and Dual Air Density Explorer

Dynamics Explorer 1

Dynamics Explorer 1 (DE-1 or Explorer 62) was a NASA high-altitude mission, launched on 3 August 1981, and terminated on 28 February 1991.

See Explorers Program and Dynamics Explorer 1

Dynamics Explorer 2

Dynamics Explorer 2 (DE-2 or Explorer 63) was a NASA low-altitude mission, launched on 3 August 1981.

See Explorers Program and Dynamics Explorer 2

Earth

Earth is the third planet from the Sun and the only astronomical object known to harbor life.

See Explorers Program and Earth

Earth trojan

An Earth trojan is an asteroid that orbits the Sun in the vicinity of the Earth–Sun Lagrangian points (leading 60°) or (trailing 60°), thus having an orbit similar to Earth's.

See Explorers Program and Earth trojan

Electronics

Electronics is a scientific and engineering discipline that studies and applies the principles of physics to design, create, and operate devices that manipulate electrons and other electrically charged particles.

See Explorers Program and Electronics

European Space Agency

The European Space Agency (ESA) is a 22-member intergovernmental body devoted to space exploration.

See Explorers Program and European Space Agency

Explorer 1

Explorer 1 was the first satellite launched by the United States in 1958 and was part of the U.S. participation in the International Geophysical Year (IGY).

See Explorers Program and Explorer 1

Explorer 10

Explorer 10 (also known as Explorer X or P14) was a NASA satellite that investigated Earth's magnetic field and nearby plasma.

See Explorers Program and Explorer 10

Explorer 11

Explorer 11 (also known as S-15) was a NASA satellite that carried the first space-borne gamma-ray telescope.

See Explorers Program and Explorer 11

Explorer 12

Explorer 12, also called EPE-A or Energetic Particles Explorer-A and as S3), was a NASA satellite built to measure the solar wind, cosmic rays, and the Earth's magnetic field. It was the first of the S-3 series of spacecraft, which also included Explorer 12, 14, 15, and 26. It was launched on 16 August 1961, aboard a Thor-Delta launch vehicle.

See Explorers Program and Explorer 12

Explorer 14

Explorer 14, also called EPE-B or Energetic Particles Explorer-B, was a NASA spacecraft instrumented to measure cosmic-ray particles, trapped particles, solar wind protons, and magnetospheric and interplanetary magnetic fields.

See Explorers Program and Explorer 14

Explorer 17

Explorer 17 (also known as Atmosphere Explorer-A (AE-A) and S6) was a NASA satellite, launched at Cape Canaveral from LC-17B on a Delta B launch vehicle, on 3 April 1963, at 02:00:02 GMT, to study the Earth's upper atmosphere.

See Explorers Program and Explorer 17

Explorer 18

Explorer 18, also called IMP-A, IMP-1, Interplanetary Monitoring Platform-1 and S-74, was a NASA satellite launched as part of the Explorer program.

See Explorers Program and Explorer 18

Explorer 19

Explorer 19, (Air Density experiment A, or AD-A), was a NASA satellite launched on 19 December 1963, as part of the Explorer program.

See Explorers Program and Explorer 19

Explorer 2

Explorer 2 was an American unmanned space mission within the Explorer program.

See Explorers Program and Explorer 2

Explorer 26

Explorer 26 was a NASA satellite launched on 21 December 1964, as part of NASA's Explorer program.

See Explorers Program and Explorer 26

Explorer 27

Explorer 27 (or BE-C or Beacon Explorer-C, Beacon-C or S-66C) was a small NASA satellite, launched in 1965, designed to conduct scientific research in the ionosphere.

See Explorers Program and Explorer 27

Explorer 29

Explorer 29, also called GEOS 1 or GEOS A, acronym to Geodetic Earth Orbiting Satellite, was a NASA satellite launched as part of the Explorer program, being the first of the two satellites GEOS.

See Explorers Program and Explorer 29

Explorer 3

Explorer 3 (Harvard designation 1958 Gamma) was an American artificial satellite launched into medium Earth orbit in 1958.

See Explorers Program and Explorer 3

Explorer 32

Explorer 32, also known as Atmosphere Explorer-B (AE-B), was a NASA satellite launched by the United States to study the Earth's upper atmosphere.

See Explorers Program and Explorer 32

Explorer 33

Explorer 33, also known as IMP-D and AIMP-1, is a spacecraft in the Explorer program launched by NASA on 1 July 1966 on a mission of scientific exploration. It was the fourth satellite launched as part of the Interplanetary Monitoring Platform series, and the first of two "Anchored IMP" spacecraft to study the environment around Earth at lunar distances, aiding the Apollo program.

See Explorers Program and Explorer 33

Explorer 35

Explorer 35, (IMP-E, AIMP-2, Anchored IMP-2, Interplanetary Monitoring Platform-E), was a spin-stabilized spacecraft built by NASA as part of the Explorer program.

See Explorers Program and Explorer 35

Explorer 36

Explorer 36 (also called GEOS 2 or GEOS B, acronym for Geodetic Earth Orbiting Satellite) was a NASA satellite launched as part of the Explorer program, being the second of the two satellites GEOS.

See Explorers Program and Explorer 36

Explorer 38

Explorer 38 (also called as Radio Astronomy Explorer A, RAE-A and RAE-1) was the first NASA satellite to study Radio astronomy.

See Explorers Program and Explorer 38

Explorer 4

Explorer 4 was an American satellite launched on 26 July 1958.

See Explorers Program and Explorer 4

Explorer 46

Explorer 46, (also Meteoroid Technology Satellite-A or MTS-A), was a NASA satellite launched as part of Explorer program.

See Explorers Program and Explorer 46

Explorer 49

Explorer 49 (also called Radio Astronomy Explorer-2, RAE-B) was a NASA satellite launched on 10 June 1973, for long wave radio astronomy research.

See Explorers Program and Explorer 49

Explorer 5

Explorer 5 was a United States satellite with a mass of.

See Explorers Program and Explorer 5

Explorer 52

Explorer 52, also known as Hawkeye-1, Injun-F, Neutral Point Explorer, IE-D, Ionospheric Explorer-D, was a NASA satellite launched on 3 June 1974, from Vandenberg Air Force Base on a Scout E-1 launch vehicle.

See Explorers Program and Explorer 52

Explorer 6

Explorer 6, or S-2, was a NASA satellite, launched on 7 August 1959, at 14:24:20 GMT.

See Explorers Program and Explorer 6

Explorer 61

Magsat (Magnetic field Satellite, Applications Explorer Mission-C or AEM-C or Explorer 61) was a NASA / USGS (United States Geological Survey) spacecraft, launched on 30 October 1979.

See Explorers Program and Explorer 61

Explorer 7

Explorer 7 was a NASA satellite launched on 13 October 1959, at 15:30:04 GMT, by a Juno II launch vehicle from Cape Canaveral Air Force Station (CCAFS) to an orbit of and inclination of 50.27°.

See Explorers Program and Explorer 7

Explorer 8

Explorer 8 was a NASA research satellite launched on 3 November 1960.

See Explorers Program and Explorer 8

Explorer 9

Explorer 9, known as S-56A before launch, was a NASA satellite which was launched in February 1961 to study the density and composition of the upper thermosphere and lower exosphere.

See Explorers Program and Explorer 9

Explorer S-1 (satellite)

Explorer S-1, also known as NASA S-1 or Explorer 7X, was a NASA Earth science satellite equipped with a suite of scientific instruments to study the environment around the Earth.

See Explorers Program and Explorer S-1 (satellite)

Explorer S-45 (satellite)

Explorer S-45 was a NASA satellite, which was lost in a launch failure in February 1961.

See Explorers Program and Explorer S-45 (satellite)

Explorer S-45A (satellite)

Explorer S-45A was a NASA satellite, which was lost in a launch failure in 1961.

See Explorers Program and Explorer S-45A (satellite)

Explorer S-55 (satellite)

Explorer S-55 was an American satellite launched by NASA on 30 June 1961, as part of the Explorer program.

See Explorers Program and Explorer S-55 (satellite)

Explorer S-56 (satellite)

Explorer S-56 was a NASA satellite launched on 4 December 1960, at 21:14 GMT as part of the Explorer program.

See Explorers Program and Explorer S-56 (satellite)

Explorer S-66

Explorer S-66 (also called BE-A, acronym of Beacon Explorer-A), was a NASA satellite launched on 19 March 1964 by means of a Thor-Delta B launch vehicle, but it could not reach orbit due to a vehicle launcher failure.

See Explorers Program and Explorer S-66

Extreme Ultraviolet Explorer

The Extreme Ultraviolet Explorer (EUVE or Explorer 67) was a NASA space telescope for ultraviolet astronomy.

See Explorers Program and Extreme Ultraviolet Explorer

Falcon 9

Falcon 9 is a partially reusable, human-rated, two-stage-to-orbit, medium-lift launch vehicle designed and manufactured in the United States by SpaceX.

See Explorers Program and Falcon 9

Far Ultraviolet Spectroscopic Explorer

Far Ultraviolet Spectroscopic Explorer (FUSE, Explorer 77, and MIDEX-0) represented the next generation, high-orbit, ultraviolet space observatory covering the wavelength range of 90.5–119.5 nanometre (nm) of the NASA operated by the Johns Hopkins University Applied Physics Laboratory.

See Explorers Program and Far Ultraviolet Spectroscopic Explorer

Fast Auroral SnapshoT Explorer

The Fast Auroral SnapshoT Explorer (FAST or Explorer 70) was a NASA plasma physics satellite, and was the second spacecraft in the Small Explorer program (SMEX).

See Explorers Program and Fast Auroral SnapshoT Explorer

Full-sky Astrometric Mapping Explorer

Full-sky Astrometric Mapping Explorer (or FAME) was a NASA proposed astrometric satellite designed to determine with unprecedented accuracy the positions, distances, and motions of 40 million stars within our galactic neighborhood (distances by stellar parallax possible).

See Explorers Program and Full-sky Astrometric Mapping Explorer

GALEX

Galaxy Evolution Explorer (GALEX or Explorer 83 or SMEX-7) was a NASA orbiting space telescope designed to observe the universe in ultraviolet wavelengths to measure the history of star formation in the universe.

See Explorers Program and GALEX

Gamma-ray astronomy

Gamma-ray astronomy is a subfield of astronomy where scientists observe and study celestial objects and phenomena in outer space which emit cosmic electromagnetic radiation in the form of gamma rays,Astronomical literature generally hyphenates "gamma-ray" when used as an adjective, but uses "gamma ray" without a hyphen for the noun.

See Explorers Program and Gamma-ray astronomy

Geodesy

Geodesy or geodetics is the science of measuring and representing the geometry, gravity, and spatial orientation of the Earth in temporally varying 3D.

See Explorers Program and Geodesy

Geophysics

Geophysics is a subject of natural science concerned with the physical processes and physical properties of the Earth and its surrounding space environment, and the use of quantitative methods for their analysis.

See Explorers Program and Geophysics

GEOS-3

GEOS-3, or Geodynamics Experimental Ocean Satellite 3, or GEOS-C, was the third and final satellite as part of NASA's Geodetic Earth Orbiting Satellite/Geodynamics Experimental Ocean Satellite program (NGSP) to better understand and test satellite tracking systems.

See Explorers Program and GEOS-3

Geostationary orbit

A geostationary orbit, also referred to as a geosynchronous equatorial orbitGeostationary orbit and Geosynchronous (equatorial) orbit are used somewhat interchangeably in sources.

See Explorers Program and Geostationary orbit

Global-scale Observations of the Limb and Disk

Global-scale Observations of the Limb and Disk (GOLD) is a heliophysics Mission of Opportunity (MOU) for NASA's Explorers program.

See Explorers Program and Global-scale Observations of the Limb and Disk

Goddard Space Flight Center

The Goddard Space Flight Center (GSFC) is a major NASA space research laboratory located approximately northeast of Washington, D.C. in Greenbelt, Maryland, United States.

See Explorers Program and Goddard Space Flight Center

Gravitational field

In physics, a gravitational field or gravitational acceleration field is a vector field used to explain the influences that a body extends into the space around itself.

See Explorers Program and Gravitational field

Gravity and Extreme Magnetism Small Explorer

Gravity and Extreme Magnetism Small Explorer (GEMS or SMEX-13) mission was a NASA space observatory mission. Explorers Program and Gravity and Extreme Magnetism Small Explorer are NASA programs.

See Explorers Program and Gravity and Extreme Magnetism Small Explorer

Great Observatories program

NASA's series of Great Observatories satellites are four large, powerful space-based astronomical telescopes launched between 1990 and 2003. Explorers Program and Great Observatories program are NASA programs.

See Explorers Program and Great Observatories program

Greenbelt, Maryland

Greenbelt is a city in Prince George's County, Maryland, United States, and a suburb of Washington, D.C. At the 2020 census, the population was 24,921.

See Explorers Program and Greenbelt, Maryland

GUSTO (telescope)

The GUSTO (Galactic / Extragalactic ULDB Spectroscopic Terahertz Observatory) mission is a high-altitude balloon mission that carries an infrared telescope to measure fine-structure line emission from the interstellar medium.

See Explorers Program and GUSTO (telescope)

H-IIA

H-IIA (H-2A) is an active expendable launch system operated by Mitsubishi Heavy Industries (MHI) for the Japan Aerospace Exploration Agency.

See Explorers Program and H-IIA

Heat Capacity Mapping Mission

The Heat Capacity Mapping Mission (HCMM) spacecraft was the first of a series of Applications Explorer Mission (AEM) of the Explorer program.

See Explorers Program and Heat Capacity Mapping Mission

Heliocentric orbit

A heliocentric orbit (also called circumsolar orbit) is an orbit around the barycenter of the Solar System, which is usually located within or very near the surface of the Sun.

See Explorers Program and Heliocentric orbit

Heliophysics

Heliophysics (from the prefix "helio", from Attic Greek hḗlios, meaning Sun, and the noun "physics": the science of matter and energy and their interactions) is the physics of the Sun and its connection with the Solar System.

See Explorers Program and Heliophysics

HETE 2

High Energy Transient Explorer 2 (HETE-2; also known as Explorer 79) was a NASA astronomical satellite with international participation (mainly Japan and France).

See Explorers Program and HETE 2

High Energy Transient Explorer 1

High Energy Transient Explorer 1 (HETE-1) was a NASA astronomical satellite with international participation (mainly Japan and France).

See Explorers Program and High Energy Transient Explorer 1

Hitomi (satellite)

, also known as ASTRO-H and New X-ray Telescope (NeXT), was an X-ray astronomy satellite commissioned by the Japan Aerospace Exploration Agency (JAXA) for studying extremely energetic processes in the Universe.

See Explorers Program and Hitomi (satellite)

IMAGE (spacecraft)

IMAGE (Imager for Magnetopause-to-Aurora Global Exploration, Explorer 78 or MIDEX-1) is a NASA Medium Explorer mission that studied the global response of the Earth's magnetosphere to changes in the solar wind.

See Explorers Program and IMAGE (spacecraft)

Injun (satellite)

The Injun program was a series of six satellites designed and built by researchers at the University of Iowa to observe various radiation and magnetic phenomena in the ionosphere and beyond.

See Explorers Program and Injun (satellite)

INTEGRAL

The INTErnational Gamma-Ray Astrophysics Laboratory (INTEGRAL) is a space telescope for observing gamma rays of energies up to 8 MeV.

See Explorers Program and INTEGRAL

Integrated circuit

An integrated circuit (IC), also known as a microchip, computer chip, or simply chip, is a small electronic device made up of multiple interconnected electronic components such as transistors, resistors, and capacitors.

See Explorers Program and Integrated circuit

Interface Region Imaging Spectrograph

Interface Region Imaging Spectrograph (IRIS), also called Explorer 94 and SMEX-12, is a NASA solar observation satellite.

See Explorers Program and Interface Region Imaging Spectrograph

International Cometary Explorer

The International Cometary Explorer (ICE) spacecraft, designed and launched as the International Sun-Earth Explorer-3 (ISEE-3) satellite, was launched on 12 August 1978 into a heliocentric orbit.

See Explorers Program and International Cometary Explorer

International Geophysical Year

The International Geophysical Year (IGY; Année géophysique internationale), also referred to as the third International Polar Year, was an international scientific project that lasted from 1 July 1957 to 31 December 1958.

See Explorers Program and International Geophysical Year

International Space Station

The International Space Station (ISS) is a large space station assembled and maintained in low Earth orbit by a collaboration of five space agencies and their contractors: NASA (United States), Roscosmos (Russia), ESA (Europe), JAXA (Japan), and CSA (Canada).

See Explorers Program and International Space Station

International Ultraviolet Explorer

International Ultraviolet Explorer (IUE or Explorer 57, formerly SAS-D), was the first space observatory primarily designed to take ultraviolet (UV) electromagnetic spectrum.

See Explorers Program and International Ultraviolet Explorer

Interplanetary Monitoring Platform

Interplanetary Monitoring Platform was a program managed by the NASA Goddard Space Flight Center in Greenbelt, Maryland, as part of the Explorers program, with the primary objectives of investigation of interplanetary plasma and the interplanetary magnetic field.

See Explorers Program and Interplanetary Monitoring Platform

Interstellar Boundary Explorer

Interstellar Boundary Explorer (IBEX or Explorer 91 or SMEX-10) is a NASA satellite in Earth orbit that uses energetic neutral atoms (ENAs) to image the interaction region between the Solar System and interstellar space.

See Explorers Program and Interstellar Boundary Explorer

Ionosphere

The ionosphere is the ionized part of the upper atmosphere of Earth, from about to above sea level, a region that includes the thermosphere and parts of the mesosphere and exosphere.

See Explorers Program and Ionosphere

Ionospheric Connection Explorer

Ionospheric Connection Explorer (ICON) is a satellite designed to investigate changes in the ionosphere of Earth, the dynamic region high in the atmosphere where terrestrial weather from below meets space weather from above.

See Explorers Program and Ionospheric Connection Explorer

ISEE-1

The ISEE-1 (International Sun-Earth Explorer-A or ISEE-A) was an Explorer-class mother spacecraft, International Sun-Earth Explorer-1, was part of the mother/daughter/heliocentric mission (ISEE-1, ISEE-2, ISEE-3). ISEE-1 was a space probe used to study magnetic fields near the Earth. ISEE-1 was a spin-stabilized spacecraft and based on the design of the prior IMP (Interplanetary Monitoring Platform) series of spacecraft.

See Explorers Program and ISEE-1

ISEE-2

The ISEE-2 (International Sun-Earth Explorer-B or ISEE-B) was an Explorer-class daughter spacecraft, International Sun-Earth Explorer-2, was part of the mother/daughter/heliocentric mission (ISEE-1, ISEE-2, ISEE-3).

See Explorers Program and ISEE-2

IXPE

Imaging X-ray Polarimetry Explorer, commonly known as IXPE or SMEX-14, is a space observatory with three identical telescopes designed to measure the polarization of cosmic X-rays of black holes, neutron stars, and pulsars.

See Explorers Program and IXPE

JAXA

The is the Japanese national air and space agency.

See Explorers Program and JAXA

Juno I

The Juno I was a four-stage American space launch vehicle, used to launch lightweight payloads into low Earth orbit.

See Explorers Program and Juno I

Juno II

Juno II was an American space launch vehicle used during the late 1950s and early 1960s.

See Explorers Program and Juno II

Lissajous orbit

In orbital mechanics, a Lissajous orbit, named after Jules Antoine Lissajous, is a quasi-periodic orbital trajectory that an object can follow around a Lagrangian point of a three-body system with minimal propulsion.

See Explorers Program and Lissajous orbit

Lunar orbit

In astronomy and spaceflight, a lunar orbit (also known as a selenocentric orbit) is an orbit by an object around Earth's Moon.

See Explorers Program and Lunar orbit

M-V

The M-V rocket, also called M-5 or Mu-5, was a Japanese solid-fuel rocket designed to launch scientific satellites.

See Explorers Program and M-V

Magnetosphere

In astronomy and planetary science, a magnetosphere is a region of space surrounding an astronomical object in which charged particles are affected by that object's magnetic field.

See Explorers Program and Magnetosphere

Maxar Technologies

Maxar Technologies Inc. is a space technology company headquartered in Westminster, Colorado, United States, specializing in manufacturing communication, Earth observation, radar, and on-orbit servicing satellites, satellite products, and related services.

See Explorers Program and Maxar Technologies

Micrometeoroid

A micrometeoroid is a tiny meteoroid: a small particle of rock in space, usually weighing less than a gram.

See Explorers Program and Micrometeoroid

Molniya orbit

A Molniya orbit (a, "Lightning") is a type of satellite orbit designed to provide communications and remote sensing coverage over high latitudes.

See Explorers Program and Molniya orbit

MOSFET

W and controlling a load of over 2000 W. A matchstick is pictured for scale. In electronics, the metal–oxide–semiconductor field-effect transistor (MOSFET, MOS-FET, or MOS FET) is a type of field-effect transistor (FET), most commonly fabricated by the controlled oxidation of silicon.

See Explorers Program and MOSFET

NASA

The National Aeronautics and Space Administration (NASA) is an independent agency of the U.S. federal government responsible for the civil space program, aeronautics research, and space research.

See Explorers Program and NASA

NASA Space Science Data Coordinated Archive

The NASA Space Science Data Coordinated Archive (NSSDCA) serves as the permanent archive for NASA space science mission data.

See Explorers Program and NASA Space Science Data Coordinated Archive

National Reconnaissance Office

The National Reconnaissance Office (NRO) is a member of the United States Intelligence Community and an agency of the United States Department of Defense which designs, builds, launches, and operates the reconnaissance satellites of the U.S. federal government.

See Explorers Program and National Reconnaissance Office

Neil Gehrels Swift Observatory

Neil Gehrels Swift Observatory, previously called the Swift Gamma-Ray Burst Explorer, is a NASA three-telescope space observatory for studying gamma-ray bursts (GRBs) and monitoring the afterglow in X-ray, and UV/Visible light at the location of a burst.

See Explorers Program and Neil Gehrels Swift Observatory

Neutron star

A neutron star is the collapsed core of a massive supergiant star.

See Explorers Program and Neutron star

Neutron Star Interior Composition Explorer

The Neutron Star Interior Composition ExploreR (NICER) is a NASA telescope on the International Space Station, designed and dedicated to the study of the extraordinary gravitational, electromagnetic, and nuclear physics environments embodied by neutron stars, exploring the exotic states of matter where density and pressure are higher than in atomic nuclei.

See Explorers Program and Neutron Star Interior Composition Explorer

New Frontiers program

The New Frontiers program is a series of space exploration missions being conducted by NASA with the purpose of furthering the understanding of the Solar System. Explorers Program and New Frontiers program are NASA programs.

See Explorers Program and New Frontiers program

Noctilucent cloud

Noctilucent clouds (NLCs), or night shining clouds, are tenuous cloud-like phenomena in the upper atmosphere of Earth.

See Explorers Program and Noctilucent cloud

Northrop Grumman Pegasus

Pegasus is an air-launched multistage rocket developed by Orbital Sciences Corporation (OSC) and later built and launched by Northrop Grumman.

See Explorers Program and Northrop Grumman Pegasus

NuSTAR

NuSTAR (Nuclear Spectroscopic Telescope Array, also named Explorer 93 and SMEX-11) is a NASA space-based X-ray telescope that uses a conical approximation to a Wolter telescope to focus high energy X-rays from astrophysical sources, especially for nuclear spectroscopy, and operates in the range of 3 to 79 keV.

See Explorers Program and NuSTAR

Operation Argus

Operation Argus was a series of United States low-yield, high-altitude nuclear weapons tests and missile tests secretly conducted from 27 August to 9 September 1958 over the South Atlantic Ocean.

See Explorers Program and Operation Argus

Phys.org

Phys.org is an online science, research and technology news aggregator offering briefs from press releases and reports from news agencies.

See Explorers Program and Phys.org

Polarimeter to Unify the Corona and Heliosphere

Polarimeter to Unify the Corona and Heliosphere (PUNCH) is a future mission by NASA to study the unexplored region from the middle of the solar corona out to 1 AU from the Sun.

See Explorers Program and Polarimeter to Unify the Corona and Heliosphere

Principal investigator

In many countries, the term principal investigator (PI) refers to the holder of an independent grant and the lead researcher for the grant project, usually in the sciences, such as a laboratory study or a clinical trial.

See Explorers Program and Principal investigator

Project Orbiter

Project Orbiter was a proposed United States spacecraft, an early competitor to Project Vanguard.

See Explorers Program and Project Orbiter

Project Vanguard

Project Vanguard was a program managed by the United States Navy Naval Research Laboratory (NRL), which intended to launch the first artificial satellite into low Earth orbit using a Vanguard rocket. Explorers Program and Project Vanguard are NASA programs.

See Explorers Program and Project Vanguard

Proton-K

The Proton-K, also designated Proton 8K82K after its GRAU index or SL-12 after its model number, 8K82K, was a Russian, previously Soviet, carrier rocket derived from the earlier Proton.

See Explorers Program and Proton-K

Reuven Ramaty High Energy Solar Spectroscopic Imager

Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI, originally High Energy Solar Spectroscopic Imager or HESSI or Explorer 81) was a NASA solar flare observatory.

See Explorers Program and Reuven Ramaty High Energy Solar Spectroscopic Imager

Rossi X-ray Timing Explorer

The Rossi X-ray Timing Explorer (RXTE) was a NASA satellite that observed the time variation of astronomical X-ray sources, named after physicist Bruno Rossi.

See Explorers Program and Rossi X-ray Timing Explorer

Satellite

A satellite or artificial satellite is an object, typically a spacecraft, placed into orbit around a celestial body.

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Scout (rocket family)

The Scout family of rockets were American launch vehicles designed to place small satellites into orbit around the Earth.

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Scout X-1

Scout X-1 was an American expendable launch system and sounding rocket which was flown seven times between August 1960 and October 1961.

See Explorers Program and Scout X-1

SES (company)

SES S.A., trading as SES is a Luxembourgish satellite telecommunications network provider supplying video and data connectivity worldwide to broadcasters, content and internet service providers, mobile and fixed network operators, governments and institutions.

See Explorers Program and SES (company)

SES-14

SES-14 is a geostationary communications satellite operated by SES at 47.5° West, replaces NSS-806, and designed and manufactured by Airbus Defence and Space.

See Explorers Program and SES-14

Signals intelligence

Signals intelligence (SIGINT) is the act and field of intelligence-gathering by interception of signals, whether communications between people (communications intelligence—abbreviated to COMINT) or from electronic signals not directly used in communication (electronic intelligence—abbreviated to ELINT).

See Explorers Program and Signals intelligence

Small Astronomy Satellite 2

The Small Astronomy Satellite 2, also known also as SAS-2, SAS B or Explorer 48, was a NASA gamma ray telescope.

See Explorers Program and Small Astronomy Satellite 2

Small Astronomy Satellite 3

The Small Astronomy Satellite 3 (SAS 3, also known as SAS-C before launch) (Explorer 53) was a NASA X-ray astronomy space telescope.

See Explorers Program and Small Astronomy Satellite 3

Solar Anomalous and Magnetospheric Particle Explorer

The Solar Anomalous and Magnetospheric Particle Explorer (SAMPEX or Explorer 68) was a NASA solar and magnetospheric observatory and was the first spacecraft in the Small Explorer program.

See Explorers Program and Solar Anomalous and Magnetospheric Particle Explorer

Solar Dynamics Observatory

The Solar Dynamics Observatory (SDO) is a NASA mission which has been observing the Sun since 2010.

See Explorers Program and Solar Dynamics Observatory

Solar energetic particles

Solar energetic particles (SEP), formerly known as solar cosmic rays, are high-energy, charged particles originating in the solar atmosphere and solar wind.

See Explorers Program and Solar energetic particles

Solar flare

A solar flare is a relatively intense, localized emission of electromagnetic radiation in the Sun's atmosphere.

See Explorers Program and Solar flare

Solar Mesosphere Explorer

The Solar Mesosphere Explorer (also known as Explorer 64) was a NASA spacecraft to investigate the processes that create and destroy ozone in Earth's upper of the atmosphere of Earth.

See Explorers Program and Solar Mesosphere Explorer

Solar System

The Solar SystemCapitalization of the name varies.

See Explorers Program and Solar System

Solar wind

The solar wind is a stream of charged particles released from the Sun's outermost atmospheric layer, the corona.

See Explorers Program and Solar wind

SOLAR-C

SOLAR-C (official name "High-sensitivity Solar Ultraviolet Spectroscopic Satellite") is a planned Sun-observing satellite being developed by the Japan Aerospace Exploration Agency (JAXA), the National Astronomical Observatory of Japan (NAOJ), and international collaborators.

See Explorers Program and SOLAR-C

SOLRAD 10

Solrad 10, also known Explorer 44, NRL-PL 165 and Explorer SE-C, was one of the SOLRAD series designed to provide continuous coverage of wavelength and intensity changes in solar radiation in the UV, soft and hard X-ray regions.

See Explorers Program and SOLRAD 10

SOLRAD 8

The SOLRAD 8,Explorer 30 or SE-A satellite was one of the NASA SOLRAD (Solar Radiation) program that began in 1960 to provide continuous coverage of solar radiation with a set of standard photometers.

See Explorers Program and SOLRAD 8

SOLRAD 9

Solrad 9, also known Explorer 37 and Explorer SE-B, was one of the SOLRAD (Solar Radiation) program that began in 1960 to provide continuous coverage of solar radiation with a set of standard photometers.

See Explorers Program and SOLRAD 9

Soviet Union

The Union of Soviet Socialist Republics (USSR), commonly known as the Soviet Union, was a transcontinental country that spanned much of Eurasia from 1922 to 1991.

See Explorers Program and Soviet Union

SpaceX CRS-11

SpaceX CRS-11, also known as SpX-11, was a Commercial Resupply Service mission to the International Space Station, launched successfully on 3 June 2017.

See Explorers Program and SpaceX CRS-11

SpaceX CRS-29

SpaceX CRS-29, also known as SpX-29, is a Commercial Resupply Service mission to the International Space Station (ISS) launched on 10 November 2023.

See Explorers Program and SpaceX CRS-29

SPHEREx

SPHEREx (Spectro-Photometer for the History of the Universe, Epoch of Reionization, and Ices Explorer) is a future near-infrared space observatory that will perform an all-sky survey to measure the near-infrared spectra of approximately 450 million galaxies.

See Explorers Program and SPHEREx

Sputnik 1

Sputnik 1 (Спутник-1, Satellite 1) was the first artificial Earth satellite.

See Explorers Program and Sputnik 1

Sputnik crisis

The Sputnik crisis was a period of public fear and anxiety in Western nations about the perceived technological gap between the United States and Soviet Union caused by the Soviets' launch of Sputnik 1, the world's first artificial satellite.

See Explorers Program and Sputnik crisis

Stratospheric Aerosol and Gas Experiment

The Stratospheric Aerosol and Gas Experiment (SAGE) is a series of remote sensing satellite instruments used to study the chemical composition of Earth's atmosphere.

See Explorers Program and Stratospheric Aerosol and Gas Experiment

Student Nitric Oxide Explorer

Student Nitric Oxide Explorer (SNOE ("snowy"), also known as Explorer 72, STEDI-1 and UNEX-1), was a NASA small scientific satellite which studied the concentration of nitric oxide in the thermosphere.

See Explorers Program and Student Nitric Oxide Explorer

Submillimeter Wave Astronomy Satellite

Submillimeter Wave Astronomy Satellite (SWAS, also Explorer 74 and SMEX-3) is a NASA submillimetre astronomy satellite, and is the fourth spacecraft in the Small Explorer program (SMEX).

See Explorers Program and Submillimeter Wave Astronomy Satellite

Sun Radio Interferometer Space Experiment

The Sun Radio Interferometer Space Experiment (SunRISE), is a set of CubeSats designed to study solar activity by acting as an aperture synthesis radio telescope.

See Explorers Program and Sun Radio Interferometer Space Experiment

Sun-synchronous orbit

A Sun-synchronous orbit (SSO), also called a heliosynchronous orbit, is a nearly polar orbit around a planet, in which the satellite passes over any given point of the planet's surface at the same local mean solar time.

See Explorers Program and Sun-synchronous orbit

Suzaku (satellite)

Suzaku (formerly ASTRO-EII) was an X-ray astronomy satellite developed jointly by the Institute of Space and Aeronautical Science at JAXA and NASA's Goddard Space Flight Center to probe high-energy X-ray sources, such as supernova explosions, black holes and galactic clusters.

See Explorers Program and Suzaku (satellite)

Tandem Reconnection and Cusp Electrodynamics Reconnaissance Satellites

Tandem Reconnection and Cusp Electrodynamics Reconnaissance Satellites (TRACERS) is a planned orbiter mission tasked to study the origins of the solar wind and how it affects Earth.

See Explorers Program and Tandem Reconnection and Cusp Electrodynamics Reconnaissance Satellites

THEMIS

Time History of Events and Macroscale Interactions during Substorms (THEMIS) mission began in February 2007 as a constellation of five NASA satellites (THEMIS-A through THEMIS-E) to study energy releases from Earth's magnetosphere known as substorms, magnetic phenomena that intensify auroras near Earth's poles.

See Explorers Program and THEMIS

Thor (rocket family)

Thor was a US space launch vehicle derived from the PGM-17 Thor intermediate-range ballistic missile.

See Explorers Program and Thor (rocket family)

Thor-Able

The Thor-Able was an American expendable launch system and sounding rocket used for a series of re-entry vehicle tests and satellite launches between 1958 and 1960.

See Explorers Program and Thor-Able

Thor-Agena

Thor-Agena was a series of orbital launch vehicles.

See Explorers Program and Thor-Agena

Thor-Delta

The Thor-Delta, also known as Delta DM-19 or just Delta was an early American expendable launch system used for 12 orbital launches in the early 1960s.

See Explorers Program and Thor-Delta

Toms

Toms, Tom's or TOMS may refer to.

See Explorers Program and Toms

TRACE

Transition Region and Coronal Explorer (TRACE, or Explorer 73, SMEX-4) was a NASA heliophysics and solar observatory designed to investigate the connections between fine-scale magnetic fields and the associated plasma structures on the Sun by providing high-resolution images and observation of the solar photosphere, the transition region, and the solar corona.

See Explorers Program and TRACE

Transiting Exoplanet Survey Satellite

Transiting Exoplanet Survey Satellite (TESS) is a space telescope for NASA's Explorer program, designed to search for exoplanets using the transit method in an area 400 times larger than that covered by the Kepler mission. Explorers Program and Transiting Exoplanet Survey Satellite are NASA programs.

See Explorers Program and Transiting Exoplanet Survey Satellite

TWINS

Two Wide-Angle Imaging Neutral-Atom Spectrometers (TWINS) are a pair of NASA instruments aboard two United States National Reconnaissance Office (NRO) satellites in Molniya orbits.

See Explorers Program and TWINS

Uhuru (satellite)

Uhuru was the first satellite launched specifically for the purpose of X-ray astronomy.

See Explorers Program and Uhuru (satellite)

United States Army

The United States Army (USA) is the land service branch of the United States Armed Forces.

See Explorers Program and United States Army

United States Department of Defense

The United States Department of Defense (DoD, USDOD, or DOD) is an executive branch department of the federal government of the United States charged with coordinating and supervising all agencies and functions of the U.S. government directly related to national security and the United States Armed Forces.

See Explorers Program and United States Department of Defense

USA-184

USA-184, also known as NRO Launch 22 or NROL-22, is an American signals intelligence satellite, operated by the National Reconnaissance Office.

See Explorers Program and USA-184

USA-200

USA-200, also known as NRO Launch 28 or NROL-28, is an American signals intelligence satellite, operated by the National Reconnaissance Office.

See Explorers Program and USA-200

UVEX

The Ultraviolet Explorer (UVEX) is an upcoming wide-field ultraviolet space telescope from NASA scheduled to launch in 2030.

See Explorers Program and UVEX

Van Allen radiation belt

Van Allen radiation belt is a zone of energetic charged particles, most of which originate from the solar wind, that are captured by and held around a planet by that planet's magnetosphere.

See Explorers Program and Van Allen radiation belt

Vanguard 1

Vanguard 1 (Harvard designation: 1958-Beta 2, COSPAR ID: 1958-002B) is an American satellite that was the fourth artificial Earth-orbiting satellite to be successfully launched, following Sputnik 1, Sputnik 2, and Explorer 1.

See Explorers Program and Vanguard 1

Vanguard TV-0

Vanguard TV-0, also called Vanguard Test Vehicle-Zero, was the first sub-orbital test flight of a Viking rocket as part of the Project Vanguard.

See Explorers Program and Vanguard TV-0

Wide Field Infrared Explorer

Wide-field Infrared Explorer (WIRE, also Explorer 75 and SMEX-5) was a NASA satellite launched on 5 March 1999, on the Pegasus XL launch vehicle into polar orbit between above the surface of Earth.

See Explorers Program and Wide Field Infrared Explorer

Wide-field Infrared Survey Explorer

Wide-field Infrared Survey Explorer (WISE, observatory code C51, Explorer 92 and MIDEX-6) is a NASA infrared astronomy space telescope in the Explorers Program launched in December 2009.

See Explorers Program and Wide-field Infrared Survey Explorer

Wilkinson Microwave Anisotropy Probe

The Wilkinson Microwave Anisotropy Probe (WMAP), originally known as the Microwave Anisotropy Probe (MAP and Explorer 80), was a NASA spacecraft operating from 2001 to 2010 which measured temperature differences across the sky in the cosmic microwave background (CMB) – the radiant heat remaining from the Big Bang.

See Explorers Program and Wilkinson Microwave Anisotropy Probe

X-Ray Imaging and Spectroscopy Mission

The X-Ray Imaging and Spectroscopy Mission (XRISM, pronounced "crism"), formerly the X-ray Astronomy Recovery Mission (XARM), is an X-ray space telescope mission of the Japan Aerospace Exploration Agency (JAXA) in partnership with NASA to provide breakthroughs in the study of structure formation of the universe, outflows from galaxy nuclei, and dark matter.

See Explorers Program and X-Ray Imaging and Spectroscopy Mission

References

[1] https://en.wikipedia.org/wiki/Explorers_Program

Also known as Beacon Explorers, Explorer missions, Explorer program, Explorer project, GEOS (satellite series), IMP-A, IMP-A satellite, List of Explorer program missions, List of Explorers Program missions, Medium Explorer program, Medium Explorers program, Project Explorer, SMEX bus, SMEX-Lite, Small Explorer, Small Explorer program, Small Explorers program, TERRIERS.

, Explorer 3, Explorer 32, Explorer 33, Explorer 35, Explorer 36, Explorer 38, Explorer 4, Explorer 46, Explorer 49, Explorer 5, Explorer 52, Explorer 6, Explorer 61, Explorer 7, Explorer 8, Explorer 9, Explorer S-1 (satellite), Explorer S-45 (satellite), Explorer S-45A (satellite), Explorer S-55 (satellite), Explorer S-56 (satellite), Explorer S-66, Extreme Ultraviolet Explorer, Falcon 9, Far Ultraviolet Spectroscopic Explorer, Fast Auroral SnapshoT Explorer, Full-sky Astrometric Mapping Explorer, GALEX, Gamma-ray astronomy, Geodesy, Geophysics, GEOS-3, Geostationary orbit, Global-scale Observations of the Limb and Disk, Goddard Space Flight Center, Gravitational field, Gravity and Extreme Magnetism Small Explorer, Great Observatories program, Greenbelt, Maryland, GUSTO (telescope), H-IIA, Heat Capacity Mapping Mission, Heliocentric orbit, Heliophysics, HETE 2, High Energy Transient Explorer 1, Hitomi (satellite), IMAGE (spacecraft), Injun (satellite), INTEGRAL, Integrated circuit, Interface Region Imaging Spectrograph, International Cometary Explorer, International Geophysical Year, International Space Station, International Ultraviolet Explorer, Interplanetary Monitoring Platform, Interstellar Boundary Explorer, Ionosphere, Ionospheric Connection Explorer, ISEE-1, ISEE-2, IXPE, JAXA, Juno I, Juno II, Lissajous orbit, Lunar orbit, M-V, Magnetosphere, Maxar Technologies, Micrometeoroid, Molniya orbit, MOSFET, NASA, NASA Space Science Data Coordinated Archive, National Reconnaissance Office, Neil Gehrels Swift Observatory, Neutron star, Neutron Star Interior Composition Explorer, New Frontiers program, Noctilucent cloud, Northrop Grumman Pegasus, NuSTAR, Operation Argus, Phys.org, Polarimeter to Unify the Corona and Heliosphere, Principal investigator, Project Orbiter, Project Vanguard, Proton-K, Reuven Ramaty High Energy Solar Spectroscopic Imager, Rossi X-ray Timing Explorer, Satellite, Scout (rocket family), Scout X-1, SES (company), SES-14, Signals intelligence, Small Astronomy Satellite 2, Small Astronomy Satellite 3, Solar Anomalous and Magnetospheric Particle Explorer, Solar Dynamics Observatory, Solar energetic particles, Solar flare, Solar Mesosphere Explorer, Solar System, Solar wind, SOLAR-C, SOLRAD 10, SOLRAD 8, SOLRAD 9, Soviet Union, SpaceX CRS-11, SpaceX CRS-29, SPHEREx, Sputnik 1, Sputnik crisis, Stratospheric Aerosol and Gas Experiment, Student Nitric Oxide Explorer, Submillimeter Wave Astronomy Satellite, Sun Radio Interferometer Space Experiment, Sun-synchronous orbit, Suzaku (satellite), Tandem Reconnection and Cusp Electrodynamics Reconnaissance Satellites, THEMIS, Thor (rocket family), Thor-Able, Thor-Agena, Thor-Delta, Toms, TRACE, Transiting Exoplanet Survey Satellite, TWINS, Uhuru (satellite), United States Army, United States Department of Defense, USA-184, USA-200, UVEX, Van Allen radiation belt, Vanguard 1, Vanguard TV-0, Wide Field Infrared Explorer, Wide-field Infrared Survey Explorer, Wilkinson Microwave Anisotropy Probe, X-Ray Imaging and Spectroscopy Mission.