European Space Agency
Europe's space agency, built the service module powering Artemis II.
Last refreshed: 17 April 2026 · Appears in 3 active topics
Will ESA tell member states about the valve anomaly before asking them to fund ESM-4?
Timeline for European Space Agency
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European Tech SovereigntyMentioned in: ESA press release skips valve anomaly
Artemis II Moon MissionIssued no post-mission ESM performance statement through 14 April
Artemis II Moon Mission: ESA routes ESM review to June CouncilThree Orion reworks named in one call
Artemis II Moon Mission- What is ESA's role in Artemis II?
- ESA built the European Service Module 2, providing propulsion, power and life support for the Orion spacecraft.Source: Lowdown briefing analysis
- Who built the Orion service module?
- Airbus in Bremen built ESM-2 on behalf of ESA, coordinating parts from 13 European countries.Source: Lowdown briefing analysis
- Is ESA involved in the Lunar Gateway?
- Yes, but Gateway was cancelled in 2026, leaving ESA's planned contributions without a deployment target.Source: Lowdown briefing analysis
- How many countries contributed to Artemis II?
- Thirteen European nations contributed hardware or components to ESM-2 alone.Source: Lowdown briefing analysis
Background
ESA built the European Service Module 2 that powered Orion on the Artemis II lunar flyby, completed 10 April 2026. The module's main engine delivered translunar injection so precisely that two planned correction burns were unnecessary. However, the O2 manifold pressurisation valve leaked at 10 times the ground-test prediction throughout the mission, and ESM-2 burned up on re-entry before any post-mission data could be extracted. ESA issued a press statement on 11 April praising TLI precision but omitting the valve anomaly. A further communication on 16 April also omitted the anomaly, deferring technical review to the June 2026 ministerial council.
Founded in 1975, ESA coordinates the space activities of 22 member states. The ESM programme grew from heritage Automated Transfer Vehicle technology. ESM-3, built for Artemis III, arrived at KSC from Bremen in August 2024 and has completed initial power-up in the Armstrong Operations and Checkout Building. Whether ESM-3 incorporates a corrected valve design is publicly unanswered.
ESA's structural stake in Artemis remains intact: without the ESM, Orion cannot reach the Moon. That leverage is now complicated by the ESM-2 valve disclosure gap, which member states will need to assess at the June Council before authorising continued investment in ESM-4 and beyond.
