I suggest the power to calculated on the population and particular on industry. A planet without population right now increases the power rating.
Also ship power should be increased (slightly) with research done.
Yeah Newbie, but you still think Newbies are not-smart?
Where does power come from? Not from land, but from people producing. Land without people was always invaded.
So go back to school, read your history and economy books. But this time carefully.
not-smart a miners use those planets to make cash so industry and population pr is usless u probobaly want a miner ofr tax miners planets to bring them into high pr with little ships so u can attack because u cant be bothered to get your own