The European Space Agency (ESA) is an intergovernmental organization of 23 European states that coordinates most of the continent's civil space activity. Formed in 1975 from the merger of two earlier bodies, the European Space Research Organisation and the European Launcher Development Organisation, ESA is headquartered in Paris and launches from the Guiana Space Centre in Kourou, French Guiana.[1]
ESA develops the Ariane 6 and Vega C rockets, operates a portfolio of science missions that currently includes JUICE, Euclid, Hera, and BepiColombo, and supplies the service module that powers NASA's Orion spacecraft. Its member states committed 22.3 billion euros for 2026 through 2028 at a ministerial council in Bremen in November 2025, the largest subscription in the agency's history.[2]
Organization and funding
Unlike national agencies, ESA is funded by subscriptions from its member governments. Mandatory activities such as the science program are funded by all members in proportion to national income, while optional programs, including launchers and human spaceflight, are funded only by the states that choose to join them. Industrial contracts are then distributed back to member states roughly in proportion to their contributions, a policy known as geographical return.[1]
The agency counted 23 member states as of 2026, with Cyprus becoming an associate member in March 2026.[1] At the Bremen ministerial on November 25-27, 2025, ministers pledged 22.3 billion euros over three years, about 30 percent more in nominal terms than the 16.9 billion euros subscribed in 2022. ESA's annual budget for 2026 is approximately 8.3 billion euros.[2][3] The increase reflected European concern about autonomy in space, and it contrasted with the deep cuts proposed for NASA's budget in the same period.[3]
Launch vehicles
Ariane 6, built by ArianeGroup and operated with Arianespace, is Europe's heavy-lift rocket and the successor to Ariane 5, which retired in 2023. It first flew on July 9, 2024. The rocket comes in two versions: Ariane 62, with two solid boosters, and Ariane 64, with four. The first Ariane 64 launched on February 12, 2026, placing 32 satellites for Amazon's Leo broadband constellation into low Earth orbit on the first of 18 Ariane 6 missions Amazon has contracted.[4] The lighter Vega C returned to flight in December 2024 and serves small payloads.
| Vehicle | First flight | Configuration | Payload to low Earth orbit |
|---|---|---|---|
| Ariane 62 | July 9, 2024 | Two solid boosters | About 10,300 kg |
| Ariane 64 | February 12, 2026 | Four solid boosters | About 21,600 kg |
| Vega C | July 13, 2022 | Four-stage light launcher | About 3,300 kg |
Science missions
ESA's science record includes some singular firsts. The Huygens probe, carried to Saturn by NASA's Cassini orbiter, landed on the moon Titan in January 2005, still the most distant landing ever performed. Rosetta orbited comet 67P/Churyumov-Gerasimenko from 2014 to 2016 and dispatched the Philae lander to its surface, and the Gaia observatory, which ended observations in January 2025, mapped the positions and motions of nearly two billion stars. ESA also builds and operates the Copernicus Sentinel Earth observation satellites and the Galileo navigation constellation on behalf of the European Union.[1]
The science program currently runs several flagship missions at once. JUICE (Jupiter Icy Moons Explorer) launched in April 2023 and is working through a series of gravity assists, including a Venus flyby in August 2025, on its way to Jupiter orbit in 2031, where it will study the moons Ganymede, Callisto, and Europa. Euclid, launched in 2023 on a Falcon 9, is surveying billions of galaxies from the Sun-Earth L2 point to map dark matter and dark energy; its first survey data release came in March 2025.
Hera, launched in October 2024, is a planetary defense mission that will arrive at the binary asteroid Didymos in November 2026, about a month earlier than first planned, to examine the aftermath of NASA's DART impact on the moonlet Dimorphos in 2022.[5] BepiColombo, a joint mission with JAXA launched in 2018, is scheduled to enter orbit around Mercury on November 21, 2026; reduced thruster power discovered in 2024 pushed the arrival back from December 2025.[6]
ESA is also rebuilding its flagship Mars mission. The ExoMars Rosalind Franklin rover, originally due to launch on a Russian rocket, was suspended after Russia's 2022 invasion of Ukraine. The mission is now fully funded for a 2028 launch, with NASA committed to providing the launch, radioisotope heater units, and braking engines for the landing platform, and the rover will drill up to two meters below the Martian surface to search for signs of past life.[7]
Human spaceflight and cooperation with NASA
ESA's most direct role in crewed spaceflight is the European Service Module (ESM), built by Airbus in Bremen, which provides propulsion, power, and life-support consumables for NASA's Orion capsule. An ESM flew the uncrewed Artemis I mission in 2022, and ESM-2 carried the Artemis II crew around the Moon in April 2026. In exchange, European astronauts receive seats in the Artemis program: ESA astronaut Luca Parmitano was named in June 2026 to the Artemis III crew, which is planned to test lunar lander dockings in Earth orbit in 2027.[8]
On the International Space Station, ESA contributes the Columbus laboratory and flies regular long-duration crew members. The agency selected a new astronaut class in 2022; its five career members graduated in April 2024 and began receiving station assignments, while reserve member John McFall was cleared in 2025 as the first astronaut candidate with a physical disability certified for long-duration missions.[1] ESA also supplied the ATV cargo vehicles that resupplied the station from 2008 to 2014, hardware experience that fed directly into the ESM design.
References
- European Space Agency - Wikipedia.
- ESA Member States commit to largest contributions at Ministerial - ESA.
- Europe passes record-breaking space budget while NASA hit with deep cuts - Space.com.
- Arianespace successfully launches 32 Amazon Leo satellites with the first Ariane 64 - Arianespace.
- ESA's Hera targets early arrival at Didymos asteroids - ESA.
- Thruster issues delay BepiColombo probe's Mercury arrival until November 2026 - Space.com.
- NASA renews commitment to Europe's life-hunting Mars rover despite Trump budget cuts - Space.com.
- NASA Marches Toward Artemis III Mission in 2027, Names Crew Members - NASA.