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The observed `planes of satellites' around the Milky Way and other nearbygalaxies are notoriously difficult to explain under the $\Lambda$CDM paradigm.Here, we propose an alternative solution: domain walls arising in theories withsymmetry-breaking scalar fields coupled to matter. Because of the mattercoupling, satellite galaxies experience fifth forces as they pass throughdomain walls, leading to a subset of satellites with orbits confined to thedomain wall plane. We demonstrate this effect using simple simulations of a toymodel comprising point-like satellites and an infinite domain wall, and explorethe efficacy of various planarity metrics in detecting this effect. We believethis is the first potential `new physics' explanation for the observed planesof satellites which does not do away with dark matter.

Dark sector domain walls could explain the observed planes of satellites