Researchers have discovered proof that the Milky Way absorbed a dwarf galaxy 11.8 billion years ago, marking its oldest galactic collision. The galaxy, identified as Low-energy-Kraken-Heracles (LKH), held stars totaling approximately 500 million times the mass of our Sun and was about 25% the size of the Milky Way at that time. To track this ancient merger, the team utilized data from the Gaia and Hubble space telescopes.

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