Hi,
I am loving this game so far. Great graphics, explosions and UI control. However, I am having trouble on this mission, as the captain informs me to attack the Neptune base (after defeating the first wave of corvettes)... but the base doesn't exist. There is one on Uranus' Moon but after attacking it nothing happens.
Any pointers?
Thanks!

Well, here you can find a walkthrough, but may i advice you to use this walkthrough only when you are stuck in a mission and dont read it further.
http://www.dreamcatchergames.com/dci/support/media/hegemonia_walkthrough.pdf
Before every mission you can chose what ships and heroes will follow you on that mission and later in campaigne, when you will have much more ships and heroes then avaible slots (like 3-5 slots for ships and 3-5 for heroes) will make game a little more chalenging because you will not know what you will need more for that mission in begining (for example more spy ships or more military ships or more spy heroes or administrative heroes or military heroes) and knowing what will happen will cut from fun.
Well, at least from my point of view.

Thanks Ludicro! I ended up finding it without the use of the walkthrough but thank you for sharing the link.