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Earth Return Orbiter
The Earth Return Orbiter is a European Space Agency spacecraft that would capture a container of Martian samples in Mars orbit and carry it back to Earth.
Earth sensor
An Earth sensor is a spacecraft attitude sensor that determines a satellite's orientation by detecting the Earth's limb against deep space, usually in the infrared.
EchoStar
EchoStar Corporation is an American telecommunications company headquartered in Englewood, Colorado, whose brands include Boost Mobile, DISH TV, Sling TV, Hughes, and HughesNet satellite internet.
EchoStar XXIV
EchoStar XXIV, marketed as JUPITER 3, is a geostationary communications satellite built by Maxar for Hughes, launched by SpaceX in 2023 to deliver broadband across the Americas.
Economics of reusable launch vehicles
The economics of reusable launch vehicles study whether recovering and reflying rocket hardware lowers launch costs; the Space Shuttle failed at this and SpaceX's Falcon 9 succeeded.
ECS (satellite bus)
ECS was a geostationary communications satellite bus developed by British Aerospace in the United Kingdom as successor to ESA's Orbital Test Satellite, flying five European Communications Satellites for EUTELSAT between 1983 and 1988.
Ed White (astronaut)
Ed White, also known as Edward Higgins White II, was an American NASA astronaut who became the first American to walk in space, on Gemini 4 in 1965.
Edgar Mitchell
Edgar Mitchell, also known as Edgar Dean Mitchell, was an American NASA astronaut who became the sixth person to walk on the Moon, on Apollo 14 in 1971.
Edsel D. Dunford
Edsel Delano (Ed) Dunford (1935–2008) was an American aerospace engineer and executive who led TRW's satellite programs, including Pioneer 10 and Milstar, and became TRW's president in 1991.
Effect of spaceflight on the human body
The effect of spaceflight on the human body is the set of physiological changes from weightlessness, radiation, and isolation, including bone loss and vision problems studied by NASA.
EGNOS
EGNOS, the European Geostationary Navigation Overlay Service, is Europe's satellite-based augmentation system broadcasting corrections to improve GPS accuracy and integrity, enabling about 1,000 aviation approach procedures.
Einstein Observatory
The Einstein Observatory, originally designated HEAO-2, was a NASA X-ray astronomy satellite launched in 1978 that carried the first fully imaging X-ray telescope into space, operating until 1981.
Einstein Probe
Einstein Probe is a Chinese Academy of Sciences X-ray astronomy satellite launched on January 9, 2024, to discover high-energy transients and monitor variable X-ray sources.
Ekran
Ekran (Экран, "Screen") was a Soviet series of geostationary direct television broadcasting satellites, internationally designated Stationar-T, first launched in 1976 to bring Central Television to Siberia and the Far North.
Ekspress
Ekspress (Экспресс, also written Express) is a Russian family of geostationary communications satellites built by NPO PM and successor ISS Reshetnev for RSCC since the late 1990s.
Electric sail
The electric sail, or E-sail, is a propellantless spacecraft propulsion concept that uses charged tethers to extract thrust from the solar wind, proposed by Pekka Janhunen in 2004.
Electrodynamic tether
An electrodynamic tether is a long conducting wire deployed from a spacecraft that produces electrical power or propulsion without consuming propellant, using its motion through a planet's magnetic field.
Electron first-stage recovery program
Rocket Lab's Electron first-stage recovery program, begun in 2018, recovers the small-lift rocket's first stage by guided re-entry, parachutes, and retrieval at sea instead of propulsive landing.
Electrospray thruster
An electrospray thruster is a spacecraft propulsion device that uses an electric field to accelerate charged droplets from a liquid propellant, producing micronewton thrust for small satellites.
EliteBus
EliteBus is a satellite bus product line developed by Thales Alenia Space in France for telecommunications constellations, serving as the common platform for second-generation Globalstar, O3b, and Iridium NEXT.
Elliot See
Elliot See was an American NASA astronaut selected in 1962, named command pilot for Gemini IX but killed in a 1966 jet crash before flying in space.
Elliptic orbit
An elliptic orbit, also called an elliptical orbit, is a closed, gravitationally bound path in which one body follows an ellipse around another, as the planets do around the Sun.
Elon Musk
Elon Reeve Musk is an American business executive who has led Tesla since 2008 and founded SpaceX in 2002, later buying Twitter for $44 billion in 2022.
Elon Musk's Tesla Roadster
Elon Musk's Tesla Roadster, also called the Space Roadster, is a sports car carrying mannequin Starman that SpaceX launched on the first Falcon Heavy flight in 2018 into an orbit around the Sun.
Embratel Star One
Embratel Star One is the satellite operations business of the Brazilian telecommunications company Embratel, created in 2000 and the largest satellite operator in Brazil and Latin America.
Emergency SOS via satellite
Emergency SOS via satellite is an Apple service, launched with the iPhone 14 in November 2022, for texting emergency services when no cellular or Wi-Fi network is available.
Emirates Mars Mission
The Emirates Mars Mission, also known as Hope Probe and Al-amal, is the UAE's first uncrewed orbiter to study the dynamics of the Martian atmosphere. It launched in 2020.
EMIT
EMIT (Earth Surface Mineral Dust Source Investigation) is a NASA imaging spectrometer on the International Space Station that maps minerals in Earth's arid dust regions, launched in 2022.
Emlid Reach
Emlid Reach is a family of RTK GNSS receivers made by Emlid, founded in 2014, for centimeter-accurate positioning in surveying, drone mapping, and autonomous vehicle navigation, beginning with the original Reach module in 2014.
Energia (Энергия) (rocket)
Energia (Энергия) was a Soviet super heavy-lift launch vehicle, designated 11K25, that flew twice from Baikonur in 1987 and 1988 as the launcher for the Buran shuttle.