Dark Matter Galaxy Crashed Into the Milky Way, Causing Ripples in Disk | Digital Trends
Left to right: the Large Magellanic Cloud, the Milky Way Galaxy, and Antlia 2. V. Belokurov / Marcus and Gail Davies / Robert Gendler.
New research suggests hundreds of millions of years ago, the Milky Way collided with Antlia 2, a nearby dwarf galaxy. This collision caused ripples in the disk of gas around the Milky Way which we still observe today. Antlia 2 is about one third the size of the Milky Way and is dominated by dark matter.
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