15 September 2026
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Fermi Explorer Announces an AI-Planned Mission to Alpha Centauri

Tracks Fermi Explorer's proposed interstellar mission, PSI's trajectory-design contribution, and progress toward launch within its cost and hardware constraints.

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Updated

Overview

Fermi Explorer proposes a small probe targeting launch by 2029 and an approximately 80,000-year journey toward Alpha Centauri. Philip Johnston credits Physical Superintelligence with rapidly finding a workable trajectory. Alex now describes the stated objective as reaching at least 99% of the distance, while speculating that onboard guidance could deliver an actual system encounter. Guidance plans, launch execution and long-term feasibility remain unproven.

What changed

Dates show when each podcast discussion was published.

  1. Alex clarifies the mission's stated 99%-distance objective and explicitly labels active onboard guidance and an actual Alpha Centauri encounter as his speculation, not official commitments.

  2. Johnston and PSI described an AI-generated trajectory that first slows the probe to lower its solar approach, then exploits thrust near the Sun. They framed the speed of design, rather than wholly new propulsion physics, as the breakthrough.

Podcast discussions

Sources

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Our coverage

Science & Medicine Briefing

A week of AI computation found a launchable route to Alpha Centauri

Philip Johnston spent six months failing to find a cheap trajectory to the nearest star system. A research campaign at the AI physics startup PSI, run on roughly 10 billion tokens and five or six hours of human time, returned an unintuitive answer: slow the spacecraft down first and let it fall toward the sun. The resulting Fermi Explorer mission proposes a 100-kilogram probe, a sub-$15 million budget, a launch by the end of 2029 and a journey of roughly 77,500 years.

8 min read

Version history

  • 15 Sep 2026 · Version 2

    Alex clarifies the mission's stated 99%-distance objective and explicitly labels active onboard guidance and an actual Alpha Centauri encounter as his speculation, not official commitments.

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