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Loading contentThe prime phase in which the spacecraft carries out its science — planning observations, commanding the instruments, and returning the data that is the point of the mission.
Operating the payload to carry out the mission's science.
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.
European missions, observatories, and space science imagery.