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Loading contentGrouping objects by similarity without being told the categories in advance — letting the structure in the data reveal itself. It is used to find natural classes of objects and to organise catalogues too large to label by hand.
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.