World Space Week: How British technology will help ESA return to the Moon

During World Space Week 2026 (4-10 October), attention is once again turning to the technologies that could shape the next era of lunar exploration.

Among them is LEIA, a British-developed LiDAR sensor selected by OHB for ESA’s Argonaut lunar lander.

Designed to support autonomous landings on the Moon, LEIA will provide a detailed three-dimensional view of the terrain beneath the spacecraft, helping it identify hazards and select a safe landing site without intervention from Earth.

The selection was announced during Farnborough International Air Show 2026, where OHB confirmed it had chosen MDA Space UK’s LEIA LiDAR sensor to become part of Argonaut’s hazard-detection system.

How LiDAR helps spacecraft land safely on the Moon

LiDAR (short for Light Detection and Ranging) works by sending laser pulses towards the surface and measuring the time taken for the reflected light to return. By collecting large numbers of measurements, the sensor can build up a detailed representation of the terrain.

For Argonaut, this capability could prove critical during the final stages of descent. The LEIA sensor (LiDAR for Extra-terrestrial Imaging Applications) will scan the lunar surface in three dimensions, allowing the spacecraft to construct a real-time terrain map as it approaches the ground.

Rather than relying solely on pre-existing maps or images taken from orbit, Argonaut will be able to assess the landing area directly as it flies towards it.

The system can help identify features such as craters, rocks and uneven or unsuitable ground. This information can then feed into the lander’s hazard-detection and autonomous navigation systems, enabling Argonaut to select a safer landing location within the available landing area.

Why autonomous lunar landings are so challenging

Autonomous hazard detection is particularly important because communication delays and the distance between Earth and the Moon make direct, real-time control from mission teams impractical during the critical final moments of a landing.

The spacecraft therefore needs the ability to sense its surroundings, interpret the terrain and react quickly without waiting for instructions from Earth.

The British technology behind ESA’s Argonaut mission

The selection of LEIA also highlights the growing role of the UK space industry in Europe’s plans for lunar exploration. MDA Space UK is developing the sensor as a compact solution for space-based terrain perception, while OHB is leading the development of Argonaut for the European Space Agency.

ESA’s Argonaut programme is intended to provide Europe with an independent capability to deliver cargo and other payloads to the lunar surface. Future missions could support scientific investigations, technology demonstrations and preparations for longer-term human activity around the Moon.

Why LEIA could be critical to a successful Moon landing

For a lander operating in such a challenging environment, the ability to understand the surface immediately below it could be just as important as its propulsion and navigation systems.

A detailed 3D view of the terrain gives Argonaut another layer of information when deciding where it is safe to land.

The integration of LEIA therefore represents more than the addition of a sensor. It is a key element of the spacecraft’s ability to make autonomous decisions during one of the most critical phases of its mission.

What it means for future exploration missions

World Space Week highlights the international technologies making future exploration missions possible.

While rockets and astronauts often take centre stage, systems such as LEIA demonstrate how advanced sensors, autonomy and precision navigation are becoming critical to the next generation of lunar missions.