Do “completely dark” dark matter halos exist?
Peer-Reviewed Publication
Updates every hour. Last Updated: 6-Oct-2025 21:11 ET (7-Oct-2025 01:11 GMT/UTC)
Every galaxy is thought to form at the center of a dark matter halo. Stars are formed when gravity within dark matter halos draws in gas, but astrophysicists don’t know whether star-free dark matter halos exist. A UC San Diego astrophysicist has calculated the mass below which halos fail to form.
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