I've been looking but haven't saw a post for planet enhancement beyond what you already get from missions. Such as, Mass surface melters, or hydro's, gaia seeds. Once you use them then there's no getting more unless you steal a planet from someone. I like the invading, don't get me wrong, but I have 4 large-massive ice planets from very abundant to ultra rich. Not to mention the barrens or terras that could use a gaia seed or sentiox or maybe a hydro.

Just a suggestion to maybe make a mission or npc drop for those type planet arti's.

suggested before

The reason you don't have them anymore is because you wasted them on planets like this. You need to max a planets stats before using one of these artis on it.

Definitely not, the ones you get through the missions are enough so that you can boost your production very high, we don't need to be able to do it even more.