English

Is the Interstellar Object 3I/ATLAS Alien Technology?

Earth and Planetary Astrophysics 2025-10-16 v3 Astrophysics of Galaxies Instrumentation and Methods for Astrophysics

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 0.005\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 5.9×105\sim{5.9} \times 10^{-5} au day2^{-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.

Keywords

Cite

@article{arxiv.2507.12213,
  title  = {Is the Interstellar Object 3I/ATLAS Alien Technology?},
  author = {Adam Hibberd and Adam Crowl and Abraham Loeb},
  journal= {arXiv preprint arXiv:2507.12213},
  year   = {2025}
}
R2 v1 2026-07-01T04:04:15.523Z