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Loading contentThe risk of bringing potentially hazardous material back to Earth in a returned sample. Sample-return missions are designed to contain their cargo as strictly as the most dangerous pathogens, so nothing escapes before it is shown to be safe.
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.