3I/ATLAS becomes the UN’s official target in a planetary-defence exercise: What makes this interstellar visitor worth a global campaign

Interstellar comet 3I/ATLAS is the focus of the eighth official UN and IAWN planetary-defence exercise, running from November 27, 2025, to January 27, 2026. This live, coordinated global campaign allows experts to refine tracking methods and strengthen readiness against future Near-Earth Object threats, despite the comet posing no danger to Earth.

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