A "Sausage Galaxy" Once Crashed Into the Milky Way

Around about 10 billion years ago the Milky Way collided with a small sausage-shaped galaxy in a titanic event that determined the futures of both.

In a series of five papers published in the journals Monthly Notices of the Royal Astronomical Society and The Astrophysical Journal Letters, as well as the preprint site arXiv.org, astronomers from the Simons Foundation Centre for Computational Astrophysics in the US lay out evidence that suggests the shape and size of our home galaxy was substantially affected by a violent encounter with a dwarf one they dub “The Sausage”.

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