The European Space Agency is taking a major step toward tackling one of the biggest threats to modern spaceflight: the rapidly growing cloud of debris orbiting Earth. With more satellites being launched every year, Earth’s orbit is becoming increasingly crowded—and that congestion raises the risk of high-speed debris damaging spacecraft, disrupting services, or triggering even more debris through collisions.
Right now, space safety relies heavily on tracking. ESA already uses laser-based systems to detect and monitor objects in orbit, helping operators understand where debris is and how it’s moving. Alongside detection and monitoring, collision-avoidance efforts are also improving through initiatives such as CREAM (Collision Risk Estimation and Automation Mitigation), which aims to reduce the chances of satellites crossing paths with dangerous objects.
But a newer concept is aiming to go beyond observing debris and start actively nudging it out of the way.
That’s where OMLET comes in—short for Orbit Maintenance via Laser MomEntum Transfer. OMLET is being developed as a ground-based laser system designed to slightly alter the movement of space debris. Instead of trying to capture junk or deorbit it directly, the idea is to use a high-power laser to apply a tiny change in velocity to debris objects. Even a small adjustment could be enough to reduce the likelihood of a close pass with an operational satellite.
The OMLET system is expected to combine a high-power laser platform with precision pointing systems and adaptive optics. In simple terms, this setup would help the laser stay accurately focused on a target despite atmospheric distortion and the difficulty of aiming at fast-moving objects in orbit. When the laser beam interacts with the debris, it’s expected to cause a small shift in the object’s speed and direction. The goal is to reduce the probability of a “conjunction”—a risky close approach between two objects in orbit—and potentially prevent collisions before they happen.
ESA’s OMLET project is now moving from the requirement definition stage into early design and implementation. This current development step, known as Phase A/B1, is being led by the Institute of Technical Physics at the German Aerospace Center (DLR). If the concept proves effective, it could represent an important upgrade to existing space safety technologies, offering not just smarter tracking, but a practical way to proactively manage hazards in orbit.
