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Loading contentThe vast supercluster the Milky Way belongs to, defined in 2014 by the flows of galaxies toward a common gravitational focus. It contains around a hundred thousand galaxies across half a billion light-years.
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.