@lukas Since there are not yet many astronomers on the Fediverse, this is just a hello. There are even fewer #cosmologists here - so far. ;) It's embarrassing that so many astronomers and cosmologists (the groups overlap :)) have jumped into the FB/Twitter prison, but I think that once an active group starts discovering the free world, the migration to freedom may snowball.
I wouldn't consider myself an Astronomer yet, but I'm on the way to getting there (I just started my master’s thesis).
Indeed, there doesn't seem to be a lot of Astronomy-related discussion on the Fediverse, but that might be because it is a niche in a niche. And at least in my experience Astronomers are on average more interested in Free Software than other people, so there might be a chance.
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