Mysterious ripples in the Milky Way were caused by a passing dwarf galaxy
Published 23 September 2022 Illustration: NASA JPL-Caltech R. Hurt (SSC Caltech) Using data from the Gaia space telescope, a team led by researchers at Lund University in Sweden has shown that large parts of the Milky Way's outer disk vibrate. The ripples are caused by a dwarf galaxy, now seen in the constellation Sagittarius, that shook our galaxy as it passed by hundreds of millions of years ago
https://www.lunduniversity.lu.se/article/mysterious-ripples-milky-way-were-caused-passing-dwarf-galaxy - 2025-07-01