Nature Astronomy, Published online: 18 June 2024; doi:10.1038/s41550-024-02295-8

IXPE has revealed how the spin of the accreting neutron star Hercules X-1 changes in three dimensions. The spin axis of the star moves both through the star and across the sky, hinting that the crust of the star is asymmetric by almost one part in a million.

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