for enhancement purpose, i recommend replacing advanced rocketry with galacticraft, since it's on curseforge but that doesn't matter
anyways it's more fun and simple to play that mod instead

This pack is pretty old and a legacy pack will not receive any major content mod changes. Also they are custom planets for this modpack. The state of advanced rocketry itself is also not that great but I will probably update to the latest version on Curseforge as this will hopefully fix a few of the problems advanced rocketry has.

true... space mods are really complex, especially the way they work.
still one of my fav packs though

Nice that you enjoy the pack it is also my favourite. You are of course free to just replace it for yourself if you haven't already done that.