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Flux freezing is a phenomenon regarding magnetic fields within an electrically conductive material: if the resistivity is low, the field lines stay with the material that they are passing through even if this material is moving, i.e., the more dense and less dense portions of the magnetic field remain with the material whether it moves or not. For example, the position of field lines through plasma can be moved by the plasma's motion. Neutron stars are presumed to be superconducting, i.e., no resistivity, in which case the magnetic fields present when a neutron star forms remain in place within its material.