Lunar Link completes test campaign, stored as Gateway paused

The Lunar Link communication system has completed all integration and testing, reaching full flight readiness. Following NASA’s decision to pause work on the Gateway station, the hardware will be placed in controlled storage while ESA studies alternative missions for the system.

Lunar Link was integrated at Thales Alenia Space in Cannes, France. It completed its final major integration and testing campaign, including an environmental test campaign, the first full-system test with two high-gain antennas, and a balloon-assisted antenna deployment test.

NASA’s Johnson Space Center joined the European team for an end-to-end communications demonstration, which was completed successfully. The test included encrypted communications through the Lunar Link system.

The system transitioned from the development phase to a flight-ready system, satisfied all technical requirements, and began its qualification and acceptance review. The complete flight hardware will now be placed into controlled storage and will remain flight-ready.

Lunar Link began as part of the ESPRIT programme and was planned for integration on NASA’s HALO habitation module of the Gateway station. It was designed for communications between the orbiting station and Moon explorers, as well as between lunar orbit spacecraft and surface users. After NASA decided to pause Gateway work, the programme plans changed and the system reached completion as a stand-alone unit. ESA still chose to finish it to full flight readiness.

ESA is now studying Lunar Link’s capabilities for future lunar missions and has issued an invitation to tender for repurposing studies. These studies will explore delivery to lunar orbit, independent operation, spacecraft concepts, orbital options and development schedules. They also assess possible cooperation with the Moonlight programme, the addition of scientific or technology payloads, and how the system could serve future ESA and international partner missions as an independent communication relay with an Earth link antenna.

Thales Alenia Space acted as prime contractor, with the system built at its facilities in France, Belgium, Spain and Italy, together with MDA in the United Kingdom and SENER in Spain. The completed Lunar Link is fully built, fully tested and ready for space.

For the lunar industry, Lunar Link represents a flight-proven communications asset that can be redirected to support cislunar and lunar surface missions. Its completion despite the Gateway pause demonstrates ESA’s ability to deliver complex space hardware and its readiness to repurpose such technology, potentially offering an earlier operational relay for Moon exploration programmes.

ESA’s invitation to tender is now open, with studies expected to assess spacecraft concepts, orbital options and a possible cooperation with the Moonlight programme for a lunar communications constellation.

The flight hardware will stay in controlled storage, maintained in a flight-ready state for any future repurposing mission.