Let's say for a particular planet I'm able to construct improvements A, B, or C. That is these improvements appear on the planet's production system list. I choose to construct improvement A. When complete I notice improvement A is still on the planet's production system list. That is I could select A and construct it a second time.



Question ... Is this a bug or as intended? Is there any point to having more than one of a particular improvement on a planet? Are the effects additive?



Also is there some way to check what has already been built on a planet?



Thanks.

I see you posted this a two places, ill answer them both, just in case, but im sorry for anyone that gets angry at double posts :P



For planets, you can only 'build' planetary exploitation, moon exploration (if any), taken out anomaly (if any).

Once you choose a planetary exploitation, you can change it as much as you want.



If you talking about the solar system (where you can have more than one planet), than this could be a bug, since an improvement can only be built once.

There is however two 'improvements' that convert 50% of your industry value into either dust or science. These two cannot be 'built', you just choose them when you need, stop it when you need and restart again later.



You can check what was built on a solar system if you click on the improvements tab on the lower right of your solar system screen, right next to the hangar button where you can spawn your ships.



I hope this helped! Good luck