Milky Way swallowed smaller galaxy 11.8 billion years ago

A recent study concluded that the Milky Way swallowed a dwarf galaxy approximately 11.8 billion years ago, when the universe was less than 15% of its current age. The findings were made by observing star clusters located near the galaxy's center, which are believed to have formed through this merger. This event significantly contributed to the growth of the Milky Way by adding hundreds of billions of stars, as well as accumulated gas and dark matter. The dwarf galaxy was estimated to be about a quarter of the size of the Milky Way at that time, containing approximately 500 million stars—about a quarter of the current galaxy's size—highlighting how such mergers have played a major role in shaping and evolving our solar system.

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