I have this aternos server and on aternos forum they only add mods to their server from curse forge. So I want to be able to play galacticraft with my friends on my aternos server.
I believe this issue has been discussed on numerous occasions, and thus far the decision has been to not make it available. I do know that there are Mod Packs that have Galacticraft in them though, you may be able to find one that has most of what you want then add the mods that you feel are missing.