Ancient Merger May Have Tilted the Milky Way by Over 90 Degrees
TL;DR Summary
Durham University researchers using supercomputer simulations say the Milky Way was probably rotated by more than 90 degrees in a head-on collision with the Gaia Sausage dwarf galaxy about 10 billion years ago, a gradual 'disc flip' that unfolded over hundreds of millions of years and helps explain the slow rotation of halo stars observed by Gaia; future mergers like Sagittarius and the Large Magellanic Cloud are unlikely to cause as dramatic a reshaping.
- Ancient collision with the Gaia Sausage dwarf galaxy 10 billion years ago may have flipped the Milky Way by more than 90 degrees, astronomers say The Times of India
- Milky Way flipped in collision with dwarf galaxy 10bn years ago, astronomers say The Guardian
- Cosmic gymnastics: How our Milky Way once underwent a dramatic flip EurekAlert!
- Collision With "Sausage Galaxy" Might Have Rotated The Milky Way By More Than 90 Degrees IFLScience
- The Milky Way Flipped its Disk Billions of Years Ago Universe Today
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