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Loading contentThe simplest Virtual Observatory query — 'give me every object within this radius of this position' — a standard that any catalogue service can answer, used constantly to find what is known around a point on the sky.
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.