Evidence of Ancient Galactic Collision Found, Confirmed

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Streams of stars at the edges of the Andromeda galaxy evidence a collision between the Andromeda and a dwarf galaxy that likely took place about 700 million years ago. Credit: Alan McConnachie
Streams of stars at the edges of the Andromeda galaxy evidence a collision between the Andromeda and a dwarf galaxy that likely took place about 700 million years ago. Credit: Alan McConnachie

Astronomers surveying the nearby Andromeda galaxy have discovered an association of stars in its outskirts, which they believe to be part of a separate galaxy that merged with Andromeda about 700 million years ago. The discovery corresponds to computer models created by University of Massachusetts Amherst astronomer Mark Fardal, which simulate a dwarf galaxy merging with Andromeda.


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