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Loeb Suggests 3I/ATLAS Could Be a Nuclear-Powered Craft as Consensus Holds It Is a Comet

A new analysis urges opportunistic measurements by passing spacecraft because Earth-based telescopes will struggle to see the object at perihelion.

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An image captured by Hubble of 3I/Atlas on July 21
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Overview

  • Harvard astrophysicist Avi Loeb advanced a hypothesis that 3I/ATLAS may generate its own light via nuclear power, citing a Hubble image showing a sunward glow and arguing the observed brightness is hard to reconcile with a typical comet.
  • He also contends the object's course, which will pass near Venus, Mars and Jupiter, is statistically unlikely by chance and may indicate deliberate path selection.
  • NASA classifies 3I/ATLAS as a comet, and several astronomers sharply reject an artificial-origin interpretation, with Oxford’s Chris Lintott calling such suggestions unfounded.
  • NASA says the interstellar visitor reaches perihelion on October 30 at roughly 130 million miles from the Sun, driving continued multi-instrument observations to test competing explanations.
  • A new arXiv study outlines time-critical observations by existing spacecraft, including Psyche on September 4, Mars missions on October 3 and JUICE on November 4, with possible post-perihelion tail sampling by Europa Clipper, Hera and Lucy due to poor viewing from Earth.