Our Milky Way wasn’t built slowly—it was forged in cosmic chaos. Astronomers, led by Kavli Prize-winning scientist Amina Helmi, are using “cosmic fossils” and data from the Gaia mission to reveal how a violent collision 10 billion years ago with a smaller galaxy called Gaia-Enceladus reshaped our galaxy, creating its halo and sparking new star formation. This galactic archaeology is rewriting the story of how galaxies grow—and Helmi’s team is just getting started.
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