π Milky Way swallowed a small galaxy 11.8 billion years ago
The Milky Way galaxy consumed a smaller dwarf galaxy roughly 11.8 billion years ago. This massive event happened in the early universe, when it was less than 15 per cent of its current age. Researchers estimate the dwarf galaxy contained stars equivalent to 500 million times the sun's mass. This merger, named Low-energy-Kraken-Heracles, was the galaxy's first known merger. This event significantly fueled the Milky Way's growth and star formation. π