在盖亚-香肠-土卫二（Gaia-Sausage-Enceladus）并合事件前18亿年发生大规模吸积事件的证据

通过研究银河内球状星团的动力学性质、年龄和金属丰度，研究人员发现了大规模矮星系吸积的证据。该事件发生的时间比盖亚-香肠-土卫二并合事件早18亿年。

Nature Astronomy, Published online: 17 August 2026; doi:10.1038/s41550-026-02931-5 By studying the dynamical properties, age and metallicity of globular clusters in the inner Galaxy, the authors found evidence of a massive dwarf galaxy that was accreted by the Milky Way 1.8 billion years earlier than the Gaia-Sausage-Enceladus merger.