Is the Interstellar Object 3I/Atlas Alien Technology?

Summary

[Submitted on 16 Jul 2025 (v1), last revised 21 Jul 2025 (this version, v2)] Title:Is the Interstellar Object 3I/ATLAS Alien Technology? View a PDF of the paper titled Is the Interstellar Object 3I/ATLAS Alien Technology?, by Adam Hibberd and Adam Crowl and Abraham Loeb View PDF HTML (experimental) Abstract:At this early stage of its passage through our Solar System, 3I/ATLAS, the recently discovered interstellar interloper, has displayed various anomalous characteristics, determined from photometric and astrometric observations. As largely a pedagogical exercise, in this paper we present additional analysis into the astrodynamics of 3I/ATLAS, and hypothesize that this object could be technological, and possibly hostile as would be expected from the 'Dark Forest' resolution to the 'Fermi Paradox'. We show that 3I/ATLAS approaches surprisingly close to Venus, Mars and Jupiter, with a probability of $\lesssim 0.005$\%. Furthermore the low retrograde tilt of 3I/ATLAS's orbital plane to the ecliptic offers various benefits to an Extra-terrestrial Intelligence (ETI), since it allows the object access to our planet with relative impunity. The eclipse by the Sun from Earth of 3I/ATLAS at perihelion, would allow it to conduct a clandestine reverse Solar Oberth Manoeuvre, an optimal high-thrust strategy for interstellar spacecraft to brake and stay bound to the Sun. An optimal intercept of Earth would entail an arrival in late November/early December of 2025, and also, a non-gravitational acceleration of $\sim{5.9} \times 10^{-5}$ au day$^{-2}$, normalized at 1 au from the Sun, would indicate an intent to intercept the planet Jupiter, not far off its path, and a strategy to rendezvous with it after perihelion. Submission history From: Adam Hibberd [view email] [v1] Wed, 16 Jul 2025 13:17:13 UTC (3,159 KB) [v2] Mon, 21 Jul 2025 07:43:03 UTC (3,162 KB)