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Loading contentAn extended, roughly spherical cloud of dark matter within which a galaxy or cluster is embedded.
In ΛCDM, galaxies form inside dark-matter halos whose gravity holds them together and sets their rotation. Halos merge and grow over cosmic time, seeding the cosmic web.
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.
Southern-hemisphere observatory data and imagery (VLT, ALMA partner).