Planetary invasion?

Posted on Wednesday, September 16, 2015

It seems I am missing a vital part on how this works because I regularly fail to defend my planets, even though I have significantly larger force. For example, in my last game, I lost a planet with 9 units and 10% planetary defence to an invasion force of only 3 units (?) with 20% bonus.

How does that work? How can 9 units lose to 3 units with only 10% difference in bonus? And how do I effectively defend my planets if it is that easy to succesfully invade them? Starbases does not seem to do anything and if the defending fleet is destroyed then you almost always lose the planet as a single troop transport seem to easily take planets with 9+ million people and 7-8 tiles.