Woah! I found this article from 2007 where Hubble found a "ring" of dark matter that seemed to ripple out from a collision : https://www.nasa.gov/mission_pages

Woah! I found this article from 2007 where Hubble found a "ring" of dark matter that seemed to ripple out from a collision : https://www.nasa.gov/mission_pages/hubble/news/dark_matter_ring_feature.html https://www.nasa.gov/mission_pages/hubble/news/dark_matter_r... Could this galaxy be an example of what the galaxy with the "ring" might look like some day far in the future? Fascinating stuff.