A Seattle-based nonprofit named the Fermi Explorer Mission plans to launch a small spacecraft toward the Alpha Centauri star system before the end of 2029. According to announcements from the group, the journey will take approximately 73,000 to 80,000 years to complete. The project is led by a group of executives and entrepreneurs, including Starcloud co-founders Philip Johnston, Adi Oltean, and Ezra Feilden. Johnston serves as the group’s co-founder and president, while Garrett Jameson, a former U.S. Air Force officer, will lead day-to-day operations.
Fermi Explorer Mission Announces 2029 Launch Target for Alpha Centauri Probe
Rather than relying on speculative lasers or nuclear power, the Fermi Explorer Mission utilizes existing classes of propulsion technology. The spacecraft is designed to carry a minimum payload of 2.2 pounds, or 1 kilogram, inside a shielded 4-by-4-by-4-inch box measuring 10 by 10 by 10 centimeters. The entire mission—including designing and building the spacecraft—is claimed to cost under $15 million.
AI-Assisted Physics and Solar-Electric Trajectory Design
The mission profile was developed through an AI-assisted physics research system created by Physical Superintelligence, an AI physics research lab. Matt Pines serves as the co-founder and CEO of PSI. According to reports on the research, the system conducted its work mostly on its own for three days using a billion tokens, while an astrophysicist on PSI’s staff steered the system to meet mission requirements, requested cost analyses and charts, and checked outputs for errors.
The resulting technical assessment outlines a solar-electric spacecraft that will spend roughly 12 years orbiting the Sun in an oval path. The vehicle will repeatedly dive toward the Sun and use burn maneuvers—a process called the Oberth maneuver—to gain speed through multiple orbits as it approaches escape velocity. After reaching its planned escape velocity, the spacecraft is expected to slingshot out of the solar system, leaving the solar system by the early 2040s to begin an almost entirely unpowered interstellar coast toward the Alpha Centauri AB barycenter.
Navigating Interstellar Distances and the Fermi Paradox
Alpha Centauri lies about 4.365 light-years away, or roughly 25 trillion miles from Earth. Because the stellar system is moving through space, pointing a spacecraft at its current location would result in a miss. Calculations from PSI evaluated where Alpha Centauri’s A and B stars will be in the future to determine the position requiring the least departure energy, identifying an optimum intercept near 73,012 years after launch with a heliocentric cruise speed of about 23.64 kilometers per second. The mission publicly describes the journey as passing within 2,600 astronomical units of the system’s barycenter.
The project draws inspiration from the Fermi Paradox, posed by physicist Enrico Fermi in 1950, which questions why humanity has not seen signs of intelligent extraterrestrial life given the galaxy’s age and vast number of stars. Johnston noted that once the Fermi probe launches, humanity will become a civilization capable of reaching another star, which prompts questions regarding potential filters or self-destructive phases that intelligent civilizations might face.
Payload Solicitations and Future Horizons
The Fermi Explorer Mission will soon open a three-month solicitation period for scientific and artistic payloads. The spacecraft plans to carry messages from children around the world and a digitized copy of the Voyager mission’s Golden Record.
While the mission is designed to take tens of thousands of years, project organizers view the endeavor as a symbolic and achievable first step. By utilizing tried-and-tested solar electric propulsion and embracing current constraints, the team hopes to inspire future generations to build upon the work and develop faster methods for traversing interstellar space.
