At 200 Kilometers Up, Satellites Die Within Days. A Startup Just Built One That Feeds on the Air Pulling It Down.

At 200 kilometers above Earth, the air is so thin you'd suffocate in seconds without a suit. There's barely a molecule to speak of. And yet — there's just enough to slowly, silently drag any satellite back into the atmosphere within days.

That's why nobody puts satellites there.

A Spanish startup just decided to do it anyway. And the way they plan to keep a satellite alive at that altitude is either the cleverest idea in modern aerospace — or the most audacious bet in the history of small satellites.

The Zone Nobody Uses

The region between 150 and 350 kilometers is called Very Low Earth Orbit — VLEO. It's closer to you right now than London is to Manchester. The International Space Station orbits more than twice as high, at 420 km. And for sixty years of the space age, VLEO has been treated as a passing lane — rocket stages fall through it, brief science missions dip into it — but nobody parks there. The atmosphere is an invisible wall.

Here's the problem with ignoring it: the closer you get to Earth, the more you can see. And what you can see at 200 kilometers is something no commercial satellite currently offers.

What You See from Half the Height

Physics is blunt about resolution. Drop your altitude in half, and you see roughly twice as sharply. Commercial Earth-observation satellites operating at 400–500 km today can resolve objects about 25–30 centimeters across. At 200 km, you're looking at 10–12 centimeters.

That's a license plate. That's a child on a bicycle. That's the specific model of the car parked outside a building.

The only satellites that currently see with that precision are classified military ones with their own congressional budget lines. VLEO is the shortcut that could hand that capability to commercial operators — if someone figures out how to survive there.

The Problem: Satellites Die Here

Here's what happens when you put a satellite at 200 km. Atmospheric drag — even in near-vacuum — slows it down fractionally. It drops slightly lower. The air gets marginally thicker. It slows further. The spiral is gentle but relentless. Within days to weeks, the satellite is a fireball over the Pacific.

You can fight drag with thrusters. But thrusters need propellant. At VLEO, you'd burn through fuel so fast that the satellite's entire mass would have to be propellant tank. No room for cameras. No room for sensors. Just a burning can falling out of the sky.

Engineers have known about this tradeoff for decades. VLEO is incredible for observation. VLEO kills satellites. The puzzle seemed to have no clean answer.

What If the Thing Killing Your Satellite Is Also Its Fuel?

That's the premise behind air-breathing electric propulsion — ABEP. Instead of launching with propellant from Earth, the satellite scoops the ultra-thin upper atmosphere through a forward intake. At VLEO altitudes, that gas is mostly atomic oxygen — individual atoms, not even molecules. The intake funnels them into an ion thruster, which ionizes them using solar electricity and shoots them out the back as thrust.

The drag becomes the engine. The enemy becomes the propellant.

It sounds like a perpetual motion machine. It isn't — the satellite still loses energy to drag. But by harvesting some of those same atmospheric molecules, it compensates enough to hold orbit indefinitely. As long as the Sun keeps charging the solar panels, the satellite keeps flying. In theory, it could operate at VLEO for years.

Kreios Space. Never Heard of Them. You Will.

On August 4, 2026, Kreios Space — a Spanish startup — announced it will conduct the world's first VLEO flight demonstration of air-breathing electric propulsion, launching aboard a Kongsberg NanoAvionics satellite bus.

Not a government agency. Not a defense contractor with a classified budget. A startup, on a small satellite, attempting what has never been flown in space before.

The mission isn't going to photograph your neighborhood — it's a pure engineering demonstration. A proof that the physics holds up in orbit the way the math says it should. But if it works, the ripple effects touch everything: Earth observation, disaster response, climate monitoring, maritime surveillance.

Why Nobody Has Done This Before

ABEP has been on engineering whiteboards since the 1960s. The physics checks out. The execution is where things get hard.

The intake has to capture molecules traveling at roughly 7.8 km/s relative to the spacecraft — that's orbital velocity, more than 20 times the speed of sound. You can't stick a funnel out the front. The intake geometry, the ionization efficiency, the thrust-to-drag ratio — all of it has to be precisely calibrated for conditions that don't exist in any lab on Earth. You can simulate it. You can model it. But you can only truly test it in space.

ESA and JAXA have both funded theoretical and ground-based research. Papers have been published. Components have been tested in vacuum chambers. Kreios Space says it's ready to take the jump to orbit. We'll find out.

To be fair: there's a vast gap between a successful demonstration and a commercially operating VLEO constellation. If the mission shows promising results, the engineering challenges of scaling up, achieving sustained thrust balance, and surviving the radiation environment long-term are still formidable. This is step one of what could be a very long staircase.

What a VLEO Constellation Would Actually Change

Think about what 10 cm resolution from orbit means in practice. Methane leaks from oil infrastructure, currently estimated from orbit with significant uncertainty, would become individually visible. Ships attempting to go dark in contested waters would have nowhere to hide. Active wildfire fronts could be mapped in near-real-time, not just sampled between satellite passes. Individual trees in a deforested zone could be counted.

That's the optimistic case. The uncomfortable case follows the same logic in the other direction. Every government, intelligence service, and corporation that currently pays for commercial satellite imagery would immediately want 10 cm resolution. The conversation about orbital surveillance law — about who has the right to photograph what from 200 km — is already lagging behind the technology that exists today at 400–500 km. VLEO would accelerate that problem significantly.

The SkyLens learn section has more on how orbital altitude affects what satellites can do. And you can see the current distribution of real satellites across all orbital shells on the live tracker.

The Last Unclaimed Altitude

We are in a moment where every layer of Earth orbit is being colonized simultaneously. Low Earth Orbit is crowded with communications constellations. Medium orbit belongs to navigation systems. Geostationary slots have been fought over for decades with legal filings and political pressure. VLEO — the zone closest to Earth, the one with the sharpest view — is the last major altitude band where essentially no one operates.

If Kreios Space's demonstration succeeds, that changes. Other companies are already watching. The window to establish norms for VLEO — what can be observed, at what resolution, subject to what accountability — is open right now. Once the commercial rush begins, those conversations become vastly harder to have.

A startup in Spain just fired the starting pistol.

For more stories on where the space industry is heading next, the SkyLens blog covers launches, satellite policy, and orbital science weekly.