From: Miami, Florida, U.S.A.
Huh, I could've sworn I had seen Ice mention what exactly they did a long time ago. Ahh well, thank you.
I posted it here long, long ago.
Here is the contents.
The factors for difficulty levels are ( 0.7, 1.0, 1.25, 1.6, 2.0) from easiest to hardest.
The player's war weariness, and corruption are multiplied by the difficulty factor.
The player's research rate, mining rate, population growth rate, targeting factor, countermeasure factor, colonyship build speed, and colony income factor are divided by the factor.