Some very general space communities communities:
https://mander.xyz/c/space
https://sh.itjust.works/c/spaceflight
They are both pretty active by Threadi standard.
A community to talk about the Fediverse and all it's related services using ActivityPub (Mastodon, Lemmy, Mbin, etc).
If you wanted to get help with moderating your own community then head over to !moderators@lemmy.world!
Learn more at these websites: Join The Fediverse Wiki, Fediverse.info, Wikipedia Page, The Federation Info (Stats), FediDB (Stats), Sub Rehab (Reddit Migration)
Some very general space communities communities:
https://mander.xyz/c/space
https://sh.itjust.works/c/spaceflight
They are both pretty active by Threadi standard.
Mastodon: fediscience.org , that's for all kind of science. Sign-ups requirements are to give your ORCID (persistent identifier for scientist in case of name changes etc)
Lots of great STEM communities exist on mander.xyz, but it's an older and sometimes very slow Lemmy instance, so I would recommend accessing them via a more modern and far easier to use PieFed instance such as PieFed.social or PieFed.zip, e.g. no login needed to view https://piefed.zip/c/astronomy@mander.xyz.
Good list. What I love about these specialized spaces is they're built around shared interests rather than algorithmic engagement.
I think that's why projects like Zeitgeist resonate with fediverse folks - we're trying to measure genuine opinion, not engagement bait. If you can see people who care about aerospace, or science, or privacy talking directly without an algorithm reshuffling the conversation, that's the internet as it was meant to be.