Galactic archaeologists find stars in the Milky Way came from another galaxy 12 billion years ago

An illustration shows a stage in the predicted merger between our Milky Way galaxy and the neighboring Andromeda galaxy, as it will unfold over the next several billion years. NASA; ESA; Z. Levay and R. van der Marel, STScI; T. Hallas; and A. Mellinger Look up on a dark night and the Milky Way appears as a calm band of

A new study suggests one of the most significant clashes in the history of the Milky Way, dubbed the "Low-energy-Kraken-Heracles" merger, happened 12 billion years ago.