Hi, I've searched a lot of threads but there doesn't seem to be an answer to my question =X.

So, What exactly stays on an invaded planet after invasion? (I noted someone said resource buildings past your research tree is removed)
Do the artifact buildings stay?

I do not think anything is removed. The resource buildings past your tech level just do not produce.

1. All buildings stay as they were on the time of invasion
2. any buildings you are not capable of building yourself do not give you any benefit
3. population restores itself normally

Thanks guys.