Astronomers Find Stellar Stream of Extragalactic Origin in the Vicinity of the Sun

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“Galaxies form by swallowing other galaxies,” said lead author Dr. Lina Necib, a postdoctoral researcher in the Walter Burke Institute for Theoretical Physics at Caltech.

“We’ve assumed that the Milky Way had a quiet merger history, and for a while, it was concerning how quiet it was because our simulations show a lot of mergers.”
“Now, with access to a lot of smaller structures, we understand it wasn’t as quiet as it seemed.”
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