90% sure in manthanos I just mass explored 9 planets from one system and 2 from another for 0 GC
oh wait, had to go back to HQ to see update, was able to go to build page and it still showed same GC amount.
This game has too many issues that revolve around needing to go back to HQ for update
The Developers are working hard to fix this in the future, unfortunately it is built for a web browser. I am just glad my bank does not work the same way =)