I have couple questions about starbases:
1. military starbases - do they upgrade ships only in the starbase radius? If I have a ship 1 tile away from radius will it be affected? Do they affect ships defending planets?
2. economy starbases - if I have 1 starbase between 2 planets, are all the upgrades affecting both planets?
Do trade improvements affect only trades originating from those planets, or if the route just passes thru starbase radius, is that trade affected too? If a planet is within radius of 2 starbases, do the bonuses add up?
3. influence starbases - do they affect my planets too, or are they only affecting other civs planets? Does it make sense to build them close to my planets?
4. resource starbases - most of the mining resources are not even close to planets, does it make sense to build starbase there?