The problem isn't
technical. It's economic.
Robotic capture and harpoon systems approach debris removal as an individual object problem. Each piece of debris becomes a separate mission, a separate cost centre, a separate liability.
With 130 million fragments in LEO, this framing makes the problem permanently unsolvable. Kepler 13 uses laser precision to feed a passive gas drag system — handling millions of objects at a cost per fragment orders of magnitude lower than any capture approach.
Physics, applied.
Live simulation — select a stage to see how the two-layer system works together.
Laser Nudge
A ground-based laser fires short, high-power pulses at a tracked piece of debris as it passes overhead. Each pulse vaporises a tiny amount of surface material — that vapour jets outward, pushing the object in the opposite direction.
It's slow and deliberate. But it doesn't need to stop the debris entirely. It just needs to nudge it — lowering its orbit by a few kilometres until it enters the xenon gas cloud at 500–600 km.
Laser ablation is already demonstrated physics. Ground stations exist. The targeting is proven. This is the precision layer of Kepler 13.
The laser is not trying to deorbit debris by itself. That would take years of passes and enormous power. Its only job is to push debris from higher orbits into the 500–600 km corridor where the gas cloud operates. A drop of just 50–200 km is enough. That is achievable in weeks, not years.
A network of ground stations — ideally at multiple latitudes — track known debris objects and fire timed pulses during each overhead pass. Each pass delivers a small Δv. After enough passes, the debris orbit decays into the gas drag zone.
The transparency problem is real: firing lasers at objects in orbit is politically sensitive. Clerk publishes its full target list, firing schedule, and predicted trajectories publicly before every session. Full transparency is the political solution.
Ground-based laser ablation has been demonstrated in laboratory conditions. The hardware exists. The physics is settled. The remaining challenge is scale and political coordination — not feasibility.
Gas Drag
Once debris has been nudged into the 500–600 km corridor by the laser system, it enters the gas cloud. We maintain a persistent xenon gas density in this band — thin enough that it doesn't affect functioning satellites, thick enough to matter for debris.
Every fragment that passes through loses a little velocity. Not much — but enough. Over weeks and months, the drag accumulates. The orbit decays. The debris spirals inward and burns up in the atmosphere.
No tracking. No contact. No individual targeting. The laser does the precision work; the gas cloud does the scale work. They are designed for each other.
To make gas drag work, you need to get 1,000 to 10,000 kg of inert gas — xenon, argon, or krypton — into a precise orbital corridor at 500 to 600 km altitude, release it in a controlled plume, and do it repeatedly and cheaply enough that the economics still work.
Small orbital platforms — roughly 200 to 400 kg each — carry pressurised gas tanks and a precision valve release system. They sit in the target orbital band permanently and release metered gas bursts timed to coincide with debris-dense corridor transits.
This is essentially the same hardware as an ion propulsion xenon tank, just much larger and venting outward rather than through a thruster nozzle.
A SpaceX Falcon 9 can put roughly 22,000 kg into LEO for about $67M. A single launch could carry multiple gas platforms. The gas itself — industrial xenon — costs roughly $800 to $1,200 per kg on Earth. Getting it to orbit is the expensive part. That is exactly why the economics of this approach are the biggest unresolved challenge.
Two systems. One mission.
Ground-based laser array commissioned. Initial target list published. First precision nudge operations on tracked high-risk objects.
Xenon injection platforms deployed to 500–600km corridor. Gas density brought to operational levels. Laser-nudged debris begins entering the drag zone.
Laser and gas systems operating in concert. Debris nudged into corridor; gas drag handles mass deorbit. First measurable reduction in fragment density.
Sustained two-layer operations. New debris generation offset by removal rate. LEO debris density plateau broken for the first time.