Invasion Math

Posted on Wednesday, March 29, 2017

I recently had several planets that were invaded by a "lesser" opponent.  I was defeated and was unsure why.  It looked like my tech was significantly better.  I had all of the invasion protection that I had built on the planet.  I had plenty of people and the invader only had one transport with 2.5 population. 

So this raised the question of how the math works for an invasion.  I know the generalities of how it works but does anyone know the specifics of the math that decides win/lose?