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Loading contentExplaining a risk to decision-makers and the public accurately and without alarm — including retracting a warning when better data clears an object, as happened with Apophis. Clear communication is itself part of planetary defence.
Facts on this topic will be cited from these primary and reference sources.
Mission data, planetary science, space telescopes, and public-domain imagery.
Most NASA-produced imagery is in the public domain; individual items are checked for usage terms before publication.