Our galaxy, perhaps like many in the universe, is a bit of a Frankenstein’s monster.

A new study makes a compelling case that a central structure in the Milky Way is actually composed mostly of stars born in another galaxy, brought to us by a long-ago galactic smash-up.

10 billion years ago, our own galaxy collided with a smaller dwarf galaxy in a crash so intense that it ripped the smaller body apart and forever changed the structure of the Milky Way.

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