An Asteroid Will Fly Inside Our Satellite Belt in 2029. Earth's Gravity Will Physically Reshape It. ESA Just Contracted the First Spacecraft Built to Land on the Surface.

In three years, a rock wider than the Eiffel Tower is going to fly past Earth so close that it passes inside the orbit of our own weather satellites.

Earth's gravity will physically deform it. Landslides will roll across the surface in slow motion. Boulders that haven't moved in three billion years will shift.

And for the first time in history — we'll have a spacecraft sitting on it when it happens.

ESA signed the contract today.

The Asteroid That Made Astronomers Work Through the Night

It's called Apophis. And when astronomers catalogued it in June 2004, the numbers coming out of their computers were alarming.

The initial orbital calculations gave a 1-in-37 chance of impact on April 13, 2029. That's roughly the odds of rolling a one on a six-sided die. For 24 hours, it was the most dangerous space rock ever recorded. Scientists at NASA's Jet Propulsion Laboratory were running calculations through the night.

Then better radar data came in. The impact was ruled out. But the close flyby remained — and it is extraordinary.

On April 13, 2029, Apophis will pass within 31,600 kilometers of Earth's surface.

To understand how close 31,600 km really is: our geostationary weather satellites — the ones tracking hurricanes, routing your phone signal, broadcasting your TV — orbit at 35,786 km. Apophis will fly below them. Inside the ring of our own infrastructure. It will pass closer to Earth's surface than the satellites you're relying on right now.

What Earth's Gravity Is Going to Do to It

Here's the part that doesn't get enough attention. We're not just going to watch Apophis fly past. We're going to watch Earth physically alter the asteroid in real time.

As Apophis falls into Earth's gravitational field, the same tidal forces that pull our oceans into high tide will work on every boulder, pebble, and grain of dust on that rock. The near side will be pulled harder than the far side. The whole asteroid will flex and compress.

Planetary scientists expect landslides. The spin may change. New craters could form as material shifts. Boulders sitting undisturbed since the early solar system will move for the first time.

This has never been observed before in recorded history. A known large asteroid being physically reshaped by Earth's gravity, in real time, with cameras watching.

The Mission: RAMSES

ESA wasn't going to let this pass unused. They're sending a spacecraft.

It's called RAMSES — Rapid Apophis Mission for Space Safety. It will launch in late 2028, intercept Apophis months before closest approach, match its speed, and ride alongside the asteroid through the most dramatic planetary flyby in human history. You can read about how missions like this work in the SkyLens space explainer.

But today — July 2, 2026 — ESA announced something that makes RAMSES even more remarkable. They've contracted a Spanish aerospace company called EMXYS to build a spacecraft unlike anything attempted before.

It's called Don Quijote. It's the size of a shoebox. And it will separate from the RAMSES mothership and descend directly onto the surface of Apophis — becoming the first CubeSat in history designed to operate on the surface of an asteroid. During a planetary flyby. While Earth's gravity is pulling the rock apart.

Why a Shoebox Changes Everything

Traditional spacecraft orbit their targets. They photograph from a distance. They swoop and fly past. But landing directly on an asteroid — one that's tumbling, near-weightless, and being stressed by Earth's gravity — is an engineering problem unlike any we've solved before.

Apophis has almost no gravity of its own. A person standing on it would weigh less than a postage stamp. The surface is likely what scientists call a rubble pile — a loosely packed collection of rocks held together by cohesion and gravity, now being gently pulled apart by Earth. Don Quijote has to anchor itself to this shifting, crumbling surface while the asteroid flies past an entire planet.

ESA said the CubeSat is designed specifically to operate under these conditions — but what that engineering looks like at a shoebox scale is exactly what makes this contract significant. The full technical details of how Don Quijote will anchor itself haven't been released yet. That part, as they say, is the hard part.

The Planetary Defense Connection

In 2022, NASA crashed the DART spacecraft into a small asteroid called Dimorphos and shortened its orbital period — proving for the first time that humans could alter an asteroid's trajectory. That was the proof that kinetic impactors work. But it raised an immediate follow-on question: what kind of asteroid were we hitting?

Apophis is in a similar category of uncertainty. We don't know if it's solid rock or a loosely packed rubble pile held together by static. We don't know how forces propagate through it. We don't know how it will respond to being pushed. The RAMSES mission — and Don Quijote sitting on the surface — is designed to answer those questions. Browse all SkyLens planetary defense stories to see how the science has developed from DART to here.

Apophis is not going to hit us. NASA has confirmed zero impact probability through at least 2068. But it is the closest large asteroid flyby in recorded history, on a known trajectory, at a known time. Scientists plan around this the way fire departments run drills in buildings they expect to be fine. You practice on a known scenario so you're ready for the unknown one.

April 13, 2029: Mark Your Calendar

Apophis will be visible to the naked eye as it passes. No telescope. No app. From Europe, Africa, and parts of Asia, you'll watch a point of light cross the sky in real time — visibly moving faster than stars, slower than a plane. A 370-meter rock flying past at 7.4 kilometers per second.

That's faster than a bullet by a factor of eight. It would cross the Atlantic Ocean in just under eight minutes.

And somewhere on the surface of that rock, a shoebox built by engineers in Spain will be measuring every tremor, every shifted boulder, every ripple that Earth's gravity sends through three billion years of compressed rubble.

We have three years to get there. ESA is moving. The contract was signed this morning. Track every spacecraft currently in orbit — including future Apophis mission hardware once it launches — on the SkyLens live tracker.

Sources: ESA RAMSES mission announcement and EMXYS CubeSat contract, July 2, 2026. Apophis orbital data and impact probability via NASA JPL Center for Near Earth Object Studies. Apophis size and flyby parameters via ESA Space Safety Programme.