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Loading contentJudging how serious a possible impact is — its probability, the object's size and energy, and the time until the encounter — and expressing it on the Torino and Palermo scales so the risk can be understood and compared.
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.