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Is 3I/ATLAS a natural comet or a technological object?

Asked 2 Nov 2026 by ·2 answers·0·0 following
Two answers, none aheadNone is ahead yet. See what would settle it.

Where it stands

Two answers have been proposed. None is ahead on the evidence yet. Two are still possible.

Why it matters

A preprint in July 2025 raised the possibility of alien technology, and the claim drove most of the press coverage. It makes predictions that the observations can test.

Answers 2

Evidence: 2 for
Still possible
A technological object
Evidence for it, no test yet
Evidence: 1 for, 2 against
Still possible

History

  1. Cordiner et al.: its gases and tails are a comet'sFor: A natural comet from another planetary system
  2. Roth et al.: its gases and tails are a comet'sFor: A natural comet from another planetary system
  3. Space.com: NASA: it looks and behaves like a cometFor: A natural comet from another planetary system
  4. Jacobson-Bell et al.: four radio searches found nothingAgainst: A technological object
  5. Sheikh et al.: four radio searches found nothingAgainst: A technological object
  6. Wright: the anti-tail and other "anomalies" have comet explanationsAgainst: A technological object
  7. Ferellec et al.: its gases and tails are a comet'sFor: A natural comet from another planetary system
  8. Belyakov et al.: its gases and tails are a comet'sFor: A natural comet from another planetary system
  9. Biver et al.: its gases and tails are a comet'sFor: A natural comet from another planetary system
  10. NASA Science: NASA: it looks and behaves like a cometFor: A natural comet from another planetary system
  11. Li et al.: four radio searches found nothingAgainst: A technological object
  12. Li et al.: four radio searches found nothingAgainst: A technological object
  13. Session 1: raised the question, proposed two answers and found five results bearing on its answers
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