A nonprofit group has announced it will send a spacecraft toward the nearest star system by late 2029, using a flight path discovered by artificial intelligence that could cut the journey to around 80,000 years. The Fermi Explorer Mission revealed its plan today in a paper, describing how an AI research tool developed by Physical Superintelligence (PSI) identified a novel trajectory to Alpha Centauri, which sits 4.4 light-years from Earth. The mission represents a stark departure from earlier interstellar projects that promised faster timelines but never launched.
The spacecraft will carry at least one kilogram of cargo, including artistic and scientific materials, messages, and a replica of the Golden Record that NASA sent aboard the Voyager probes in 1977. The entire mission is budgeted at just $15 million, funded by private donors, and deliberately avoids the constraint of completing the voyage within a human lifetime. Alpha Centauri lies roughly 25 trillion miles away, and Voyager 1—one of humanity's fastest-launched objects—has traveled less than 1% of that distance since 1977 despite moving at a pace that would require over 70,000 years to complete the trip. The AI system, called Get Physics Done, worked largely independently for three days on a billion tokens, combining familiar orbital maneuvers in an arrangement the Fermi team hadn't considered: the spacecraft would decelerate into a tight solar orbit closer than Mercury, then fire its engine during each close pass to exploit solar panels receiving four times the usual light.
"We didn't want to do another Breakthrough Starshot," says Philip Johnston, cofounder and president of the Fermi Explorer Mission, referencing billionaire Yuri Milner's 2016 announcement of an interstellar mission that pledged $100 million but hasn't launched a decade later. Johnston and his team are "dead set on something actually launching," he says, even if that means abandoning the goal of arrival within human lifespans. Matt Pines, PSI's cofounder and CEO, notes that the AI's creativity in proposing "an entirely different mission profile" was more surprising than solving the problem itself, though he acknowledges the model still lacks a human researcher's judgment about which problems merit pursuit or which approaches hold promise.
The Fermi project aims to resolve physicist Enrico Fermi's 1950 paradox: if intelligent life exists among the galaxy's hundreds of billions of stars, most far older than our sun, we should have detected signs of civilizations that could spread across the galaxy in mere millions of years—a brief span compared to the galaxy's age. By launching a probe to another star, humanity proves that both the capability and desire to reach neighboring systems exist, eliminating two common explanations for the galaxy's apparent emptiness. That leaves darker possibilities, according to Johnston: life resembling ours might be extraordinarily rare, or intelligent species typically self-destruct before spreading. The latter scenario raises the question of whether reaching superintelligence itself proves "self-destructive," he says, and whether "there's some great filter that we do not pass through" in the coming decades. The mission's designers accept that faster spacecraft launched centuries from now will likely overtake their probe—an engine just 20% quicker developed in a thousand years would arrive more than 10,000 years earlier—but view the launch itself as the philosophical breakthrough rather than the arrival. Organizations pursuing interstellar ambitions face a strategic choice between waiting for technology that may never materialize and committing to achievable missions that redefine what exploration means when measured across geological time.