Many galaxies seem to have bubbles of dark matter enveloping them, but finding out if every galaxy is like this is an ongoing area of research, writes Chanda Prescod-Weinstein
Source:
https://www.newscientist.com/article/mg24833110-200-does-a-halo-of-mysterious-dark-matter-swirl-around-every-galaxy/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home