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

By Sven Buder, Astrophysicist, Australian National University

Look up on a dark night and the Milky Way appears as a calm band of stars across the sky. But our galaxy has a violent past.

For more than 13 billion years it has grown through star formation and mergers with other galaxies. We already know that several substantial galaxies helped build the young Milky Way.

A new study, published in Nature Astronomy, now brings one of the earliest of these events into much sharper focus. Led by astronomer Davide Massari from the Astrophysics…

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