Explorers Program

first satellite of the United States

NASA Cosmic Microwave Background probe launched in 2001

NASA satellite of the Explorer program

decommissioned American infrared space telescope

NASA space observatory

mission concerning a space observatory in low earth orbit measuring gamma ray radiation

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. In addition to paving the way for future ultraviolet missions, the space telescope allowed astronomers to uncover mysteries about the early universe and how it evolved, as well as better characterize phenomena like black holes and dark matter. GALEX was launched on 28 April 2003 for a 29-month primary mission, which was extended three times before the spacecraft was placed into standb

NASA satellite

United States space exploration program that provides flight opportunities for various investigations from space

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.

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. The name of the mission is an acronym alluding to the Titan Themis.

thumb|right|Animation of INTEGRAL spacecraft orbit trajectory The INTErnational Gamma-Ray Astrophysics Laboratory (INTEGRAL) is a retired space telescope for observing gamma rays of energies up to 8 MeV. It was launched by the European Space Agency (ESA) into Earth orbit in 2002, and is designed to provide imaging and spectroscopy of cosmic sources. In the MeV energy range, it is the most sensitive gamma ray observatory in space. It is sensitive to higher energy photons than X-ray instruments such as NuSTAR, the Neil Gehrels Swift Observatory, XMM-Newton, and lower than other gamma-ray instrum

NASA scientific satellite

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

American research satellite, lost during a launch vehicle failure

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. A main focus of the TRACE instrument was the fine structure of coronal loops low in the solar atmosphere. TRACE was the third spacecraft in the Small Explorer program, launched on 2 April 1998, and obtained its last science image on 21 J

American magnetospheric research satellite

space observatory which reentered in 2023

NASA solar observation satellite

decommissioned NASA space observatory

NASA space observatory

American military research satellite

SPHEREx (Spectro-Photometer for the History of the Universe, Epoch of Reionization, and Ices Explorer) is a near-infrared space observatory that is performing an all-sky survey to measure the near-infrared spectra of approximately 450 million galaxies. In February 2019, SPHEREx was selected by NASA for its next Medium-Class Explorers mission, beating out two competing mission concepts: Arcus and FINESSE. SPHEREx launched on 12 March 2025 on a Falcon 9 Block 5 rocket alongside the PUNCH microsatellites from Vandenberg Space Force Base. The principal investigator is James Bock at California Inst

NASA space telescope for ultraviolet astronomy

American research satellite launched in 1958

space observatory

NASA earth science satellite launched in 1959

Japanese X-ray space telescope

satellite launched by NASA for long range radio astronomy

NASA space observatory launched on 1972

American research satellite

space observatory

former NASA space observatory

1959 research satellite

space probe

NASA space observatory

NASA satellite

NASA satellite of the Explorer program

NASA satellite of the Explorer program

NASA space observatory

NASA geomagnetic satellite

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. The observatory, which was launched on 9 December 2021, is an international collaboration between NASA and the Italian Space Agency (ASI). It is part of NASA's Explorers program, which designs low-cost spacecraft to study heliophysics and astrophysics.

former NASA research satellite

United States satellite launched in 1958

NASA satellite of the Explorer program

NASA satellite of the Explorer program

NASA space observatory

American scientific satellite from Explorer programme, forth in the Interplanetary Monitoring Platform series

X-ray telescope on the International Space Station

satellite statunitense appartenente al Programma Explorer

American satellite

NASA atmospheric observation satellite

former NASA research satellite

former American research satellite

joint NASA and USGS satellite for studying Earth's magnetic field

former American research satellite

NASA atmospheric research satellite

former American research satellite

NASA satellite of the Explorer program

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. The AMPTE (Active Magnetospheric Particle Tracer Explorers) mission was designed to study the access of solar wind ions to the magnetosphere, the convective-diffusive transport and energization of magnetospheric particles, and the interactions of plasmas in space.