The Milky Way’s long-lost sibling finally found

ANN ARBOR—Scientists at the University of Michigan have deduced that the Andromeda galaxy, our closest large galactic neighbor, shredded and cannibalized a massive galaxy two billion years ago. Even though it was mostly shredded, this massive galaxy left behind a rich trail of evidence: an almost invisible halo of stars larger than the Andromeda galaxy … Continue reading The Milky Way’s long-lost sibling finally found