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Envisat
Envisat (Environmental Satellite) was a European Space Agency Earth observation satellite launched in 2002. At eight tonnes with ten instruments, it was the largest of its kind.
EnVision
EnVision is a European Space Agency Venus orbiter, adopted in 2024 as an M5 Cosmic Vision mission, scheduled to launch in 2031 to study Venus from core to atmosphere.
EOS-05
EOS-05, also known as GISAT-1A, is an Indian Earth observation satellite operated by ISRO, India's first imaging satellite in geosynchronous orbit, launched in September 2026.
Epsilon (イプシロン) (rocket)
Epsilon (イプシロン) is a Japanese solid-propellant launch vehicle developed by JAXA to launch small satellites at low cost, first flown from the Uchinoura Space Center in 2013.
Error analysis for the Global Positioning System
Error analysis for the Global Positioning System identifies and mitigates the sources separating a GPS receiver's computed position from its true position, including atmospheric delays, satellite clock and ephemeris errors, and multipath.
ERS (satellite)
ERS (European Remote Sensing) was a pair of Earth observation satellites flown by the European Space Agency from 1991 to 2011, carrying synthetic aperture radar to study land, oceans, and ice.
ERS-1
ERS-1 (European Remote-Sensing Satellite 1) was the European Space Agency's first Earth observation satellite, a radar-carrying spacecraft launched from Kourou in 1991 that operated until 2000.
ERS-2
ERS-2 (European Remote Sensing satellite 2) was an ESA Earth-observation satellite launched in 1995, designed for three years but serving more than 16 before reentering in 2024.
ESCAPADE
ESCAPADE (Escape and Plasma Acceleration and Dynamics Explorers) is a NASA mission with twin spacecraft, Blue and Gold, launched in 2025 to study how solar wind drives atmospheric loss at Mars.
Escape from Planet Earth
Escape from Planet Earth is a 2013 Canadian-American computer-animated science fiction comedy film directed by Cal Brunker. It stars Brendan Fraser and was the first feature film of Rainmaker Entertainment.
Esrange
Esrange, also known as Esrange Space Center, is a rocket range, balloon base, and satellite ground station 45 km east of Kiruna in northern Sweden, established in 1966.
Estes Industries
Estes Industries is an American model rocket company founded by Vern and Gleda Estes in 1958, known for rocket kits, engines, and STEM education programs.
ETS-VII
ETS-VII, nicknamed Orihime/Hikoboshi, was a Japanese mission of two unmanned satellites launched by NASDA in 1997 that demonstrated the first autonomous rendezvous and docking between unmanned spacecraft.
Euclid (spacecraft)
Euclid, also called the Euclid space telescope, is a European Space Agency telescope launched in 2023 to map billions of galaxies and study dark energy and dark matter.
Europa Clipper
Europa Clipper, also known as the Europa Multiple-Flyby Mission, is a NASA spacecraft launched in 2024 to investigate the habitability of Europa, Jupiter's icy ocean moon.
Europa Imaging System
The Europa Imaging System (EIS) is the visible-light camera suite on NASA's Europa Clipper spacecraft, built to map about 90 percent of Europa at better than 100 meters per pixel.
Europa Lander
Europa Lander is a proposed NASA mission concept to land on Jupiter's icy moon Europa, excavate surface material, and analyze it for biosignatures, signs of past or present life.
Europa Report
Europa Report (2013) is a found-footage science fiction film directed by Sebastián Cordero, written by Philip Gelatt, about six astronauts on a privately funded mission to Jupiter's moon Europa who lose contact with Earth.
European Astronaut Centre
The European Astronaut Centre is the European Space Agency's center for astronaut selection, training, and medical support, established in 1990 in Cologne, Germany, and home to ESA's astronaut corps.
European Data Relay System
The European Data Relay System (EDRS, Space Data Highway) is a pair of geostationary relay satellites operated by Airbus and ESA that carries Earth-observation data by laser link.
European Service Module
The European Service Module (ESM) is the ESA-built service component of NASA's Orion spacecraft, supplying propulsion, power, and life support as Europe's principal contribution to the Artemis program.
European Space Agency
The European Space Agency, also known as Agence spatiale européenne, is an intergovernmental organization of 23 European states that coordinates Europe's civilian space program; it was founded in 1975.
European Space Operations Centre
The European Space Operations Centre, ESOC, is the European Space Agency's mission control center in Darmstadt, Germany, which has flown more than 90 missions since opening in 1967.
European Union Agency for the Space Programme
The European Union Agency for the Space Programme (EUSPA), formerly the European GNSS Agency, is an EU agency headquartered in Prague that operates Galileo and EGNOS satellite navigation.
Eurostar (satellite bus)
Eurostar, also known as Astrium Eurostar, is a family of geostationary telecommunications satellite buses developed by Matra Marconi Space and successors including Airbus, flying since 1990.
EUSO-SPB2
EUSO-SPB2 (Extreme Universe Space Observatory on a Super Pressure Balloon 2) was a balloon-borne observatory testing detection of ultra-high-energy cosmic rays and neutrinos from near space in 2023.
ExoMars
ExoMars, the ExoMars Programme, is a European Space Agency Mars exploration program seeking signs of past life, combining the 2016 Trace Gas Orbiter with a rover launching in 2028.
ExoMars Trace Gas Orbiter
The ExoMars Trace Gas Orbiter (TGO) is a European Space Agency Mars orbiter, launched jointly with Roscosmos in 2016 to measure methane and other trace gases in the Martian atmosphere.
Exosat
Exosat, short for European X-ray Observatory SATellite, was a European Space Agency X-ray astronomy observatory launched in May 1983 that operated until 1986 and discovered quasi-periodic oscillations.
Expander cycle
The expander cycle is a closed rocket-engine cycle in which hydrogen heated in the cooling jacket drives the turbine, with no gas generator, used in the RL10.