A Harvard scientist is raising fresh concerns about the interstellar comet 3I/ATLAS, suggesting it might actually be an alien probe powered by nuclear energy.
Avi Loeb, who has previously speculated that 3I/ATLAS could be advanced technology, says his new hypothesis is based on a Hubble Space Telescope image taken on July 21 and released by NASA. The photo shows a glow at the comet’s front, which he argues is unlikely to be caused by sunlight or rare interstellar materials, pointing instead toward the possibility of artificial origins.
In a recent blog post, Loeb explained: “3I/ATLAS could be a spacecraft powered by nuclear energy, and the dust seen from its front may just be debris collected during its interstellar journey. While this idea can’t be ruled out, stronger evidence is needed.”
During an appearance on Elizabeth Vargas Reports, he also highlighted the comet’s unusually precise path, noting that it will pass near Mars, Venus, and Jupiter. He described the timing of its arrival as highly unlikely to be random, estimating the odds at one in 20,000, and urged that it be closely studied.
Loeb has even suggested that NASA’s Juno probe be directed to investigate the comet, while also calling for global cooperation in the event alien technology does make contact.
NASA, however, maintains that 3I/ATLAS is simply a comet, with no threat to Earth. Its name indicates it is the third interstellar object detected passing through our solar system, discovered by the Asteroid Terrestrial-impact Last Alert System.

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