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Loading contentAssigning objects to discrete categories from their measured features — star or galaxy, supernova type, real detection or artefact. It is the workhorse of survey astronomy, sorting the millions of objects a modern survey finds into kinds a human never could review one by one.
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.