The Milky Way, Andromeda and Centaurus A host flattened arrangements of satellite dwarf galaxies with correlated kinematics. The rarity of similar structures in cosmological simulations constitutes a major problem for the ΛCDM model, with no obvious solution in sight.

中文翻译：

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是时候让一些飞机说话了

银河系、仙女座和半人马座 A 拥有具有相关运动学的卫星矮星系的扁平排列。宇宙学模拟中相似结构的罕见性构成了 ΛCDM 模型的主要问题，目前还没有明显的解决方案。