After the online philosophy of dark matter workshop, a group of roughly 20 scholars (incl. physicists, philosophers and historians) has started a regular, global, online discussion group on the history, philosophy and sociology of the intersection between cosmology, astronomy and particle physics, with an initial focus on dark matter. We meet every two weeks on Wednesdays, from 17:00 till 18:00 CEST. Initially we are discussing the dark matter chapters from Peebles’ recent book “Cosmology’s Century” (hence the nickname “Peebles Fan Club” for our group), but eventually we will move on to other/broader topics that are of interest to the group. If you are interested in joining the discussion group, please contact nmartens [at] uni-bonn.de.