Nature is bringing an asteroid to us and conducting the experiment itself.
Once every several millennia, a mountain-sized rock passes close enough to Earth to be seen with the naked eye — and in April 2029, humanity will be ready to watch. In Berlin, the European Space Agency and Japan's JAXA formalized a partnership to send the Ramses spacecraft alongside asteroid Apophis during its extraordinary close approach, turning a fleeting cosmic event into a lasting scientific inheritance. The mission reflects something quietly profound: that the instinct to understand what moves through the dark above us has become, at last, a matter of collective survival.
- An asteroid the size of a skyscraper will pass closer to Earth than our own television satellites on Friday the 13th of April, 2029 — and up to two billion people will be able to watch it move across the sky with the naked eye.
- The window to study this event is irreplaceable: Apophis will not pass this close again for thousands of years, and Earth's gravity will physically reshape the asteroid in real time, making the encounter a natural experiment that cannot be staged.
- ESA and JAXA signed binding cooperation agreements in Berlin, committing hardware, launch vehicles, and operational control to the Ramses mission — translating years of shared intention into a spacecraft that must be ready by 2028.
- The data Ramses collects on how Apophis deforms under gravitational stress will directly inform how humanity might one day deflect a genuinely dangerous asteroid — filling a critical gap in planetary defense knowledge.
- The mission lands in a broader strategic moment: ESA's Hera spacecraft is already testing kinetic deflection at a distant asteroid system, and Ramses will add the missing piece — understanding how asteroids structurally respond to the forces we might use against them.
On May 7th in Berlin, the European Space Agency and Japan's JAXA signed agreements to jointly pursue one of the most remarkable scientific opportunities in living memory. In April 2029, asteroid Apophis — a 375-meter mass of rock and metal — will pass within 32,000 kilometers of Earth, closer than the satellites that carry our phone signals, and visible to the naked eye for up to two billion people. An event of this scale, for an object this size, occurs perhaps once every five to ten thousand years.
There is no danger of impact. But the flyby offers something more valuable than spectacle: as Earth's gravity pulls at Apophis, it will physically stretch and reshape the asteroid in real time. The Ramses spacecraft — Rapid Apophis Mission for Space Safety — will launch in 2028 to reach Apophis before the encounter, documenting the transformation and capturing data that could prove essential to humanity's long-term planetary defense.
The partnership divides the work deliberately. ESA will design, integrate, and operate the spacecraft. JAXA will contribute lightweight solar arrays, an infrared imaging system, and the H3 rocket to carry it all into space. The agreements were signed at the Italian Embassy, with Italy's space agency as co-host — fitting, since Italian firm OHB Italia will build the spacecraft itself. ESA Director General Josef Aschbacher marked the occasion plainly: planetary defense is a global responsibility, and these signatures move it from shared intention to concrete action.
What makes Apophis singular is that nature is doing the work of bringing the subject to the scientists. For decades, studying asteroids up close has meant sending spacecraft billions of kilometers outward. This time, the asteroid is coming to us — and the hours of its passage will generate data that researchers will spend generations interpreting.
On May 7th, in Berlin, two of the world's leading space agencies formalized what amounts to humanity's front-row seat to a cosmic event that won't happen again for thousands of years. The European Space Agency and Japan's space exploration authority signed agreements to jointly observe asteroid Apophis as it makes an extraordinarily close pass by Earth in April 2029—a moment so rare that it occurs only once every five to ten millennia for an object of this size.
Apophis is roughly 375 meters across, a chunk of rock and metal that will skim past Earth at a distance of just 32,000 kilometers on Friday the 13th of April, 2029. To put that in perspective: it will pass closer than the satellites that beam television and phone signals to your home. The moon orbits at roughly ten times that distance. For up to two billion people on Earth, the asteroid will be visible to the naked eye, a moving point of light crossing the night sky—a sight our species has not witnessed in recorded history.
There is no danger of impact. Astronomers have calculated Apophis's trajectory with confidence. But the flyby presents something far more valuable than spectacle: it offers an unprecedented natural experiment in planetary physics. As Earth's gravity pulls at the asteroid, it will stretch and reshape it, altering its surface and trajectory. The Ramses spacecraft—Rapid Apophis Mission for Space Safety—will be there to document the transformation, measuring before and after, capturing data that could reshape how humanity prepares to defend itself against future asteroid threats.
The mission itself is the fruit of deepening collaboration between ESA and JAXA, built on commitments made in November 2024 to expand cooperation on planetary defense. Ramses will launch in 2028, giving it time to reach Apophis before the April 2029 encounter. ESA will oversee the spacecraft's design, integration, and operations. JAXA will contribute critical hardware: lightweight solar arrays, an infrared imaging system, and the H3 rocket that will carry the mission to space. This division of labor reflects a partnership already tested on other missions—the Hera planetary defense spacecraft, the Earth observation mission EarthCARE, and the BepiColombo probe now studying Mercury.
The agreements were signed by ESA Director General Josef Aschbacher and JAXA President Hiroshi Yamakawa at the Italian Embassy, with the Italian Space Agency as co-host, reflecting the fact that an Italian company, OHB Italia, will serve as the prime contractor building the Ramses spacecraft. In remarks, Aschbacher framed the moment as a shift from intention to action: "Planetary defense is, by definition, a global responsibility," he said. "With today's signatures, ESA and JAXA are moving decisively from shared intention to concrete implementation."
Planetary defense itself is a young field—a blend of astronomy, physics, and engineering aimed at detecting near-Earth objects early, tracking their paths, assessing impact risks, and developing ways to deflect them if necessary. ESA's Near-Earth Object Coordination Center monitors asteroid threats and refines orbit predictions. The agency's Hera mission, arriving at the Didymos binary asteroid system later this year, will test whether we can actually move an asteroid by crashing a spacecraft into it—a technique called kinetic impact deflection. Ramses will provide crucial data on how asteroids respond to gravitational stress, knowledge that could prove essential if humanity ever needs to nudge a dangerous object out of Earth's path.
What makes Apophis unique is that the asteroid is coming to us. For decades, planetary scientists have had to send spacecraft billions of kilometers into the solar system to study asteroids up close. With Apophis, nature is conducting the experiment itself, pulling the asteroid close enough that we can observe it in detail without leaving Earth orbit. The moment will last only hours, but the data will last generations.
Citações Notáveis
Planetary defense is, by definition, a global responsibility. With today's signatures, ESA and JAXA are moving decisively from shared intention to concrete implementation.— ESA Director General Josef Aschbacher
We are pleased to have signed today the Memorandum of Cooperation and the agreement to advance cooperation on planetary defense.— JAXA President Hiroshi Yamakawa
A Conversa do Hearth Outra perspectiva sobre a história
Why does this particular asteroid matter so much? There are thousands of near-Earth objects.
Apophis matters because of the geometry. It's large enough to be dangerous—375 meters—and it's coming close enough that we can actually see it and study it in detail. Most asteroids we know about, we observe from far away or we have to send a spacecraft to them. This one is coming to us.
But you said there's no impact risk. So what's the real value of the mission?
The value is in understanding what happens to an asteroid when Earth's gravity grabs it. As Apophis passes, tidal forces will stretch and reshape it. By measuring those changes, we learn how asteroids are structured, how they respond to stress. That knowledge is essential if we ever need to deflect a dangerous object.
When you say "deflect," you mean crash something into it?
Essentially, yes. The Hera mission is testing that technique right now on a smaller asteroid. But we don't fully understand how different asteroids will respond. Apophis gives us a natural experiment—we can watch gravity do the work and measure the results.
Why are ESA and JAXA doing this together rather than separately?
Planetary defense is inherently global. No single nation can protect the entire planet. These agencies have been working together for years on other missions. This formalization of the Ramses partnership is an extension of that trust and shared capability.
What happens if something goes wrong with the spacecraft?
The mission still succeeds in its primary goal—Apophis will pass Earth regardless. But the spacecraft is designed to capture detailed measurements of the asteroid's shape, composition, and behavior during the flyby. Without it, we lose that irreplaceable data.
How many people will actually see this happen?
Up to two billion people could see Apophis with their naked eye if they're in the right place at the right time. It's a rare moment of astronomy becoming visible to the general public without a telescope.