A study led by researchers at the Instituto de Astrofísica de Canarias (IAC) comparing the discs of several pairs of spiral galaxies, active and non-active, concludes that in the active discs, the rotational motion of the stars is of greater importance.
![](https://scx1.b-cdn.net/csz/news/tmb/2020/differencesb.jpg)
Source:
https://phys.org/news/2020-08-differences-discs-non-active-galaxies.html