Hmm, you might be thinking of the second one, the RTS? The first had Earth struck by an asteroid that split in two when trying to defend. The entire game was on a far planet you travelled to, turn based strategy I believe.
I personally enjoyed the novella that came with it more than the game itself. I got frustrated having to beat these stupid levels in order to read the next chapter..
Intro video: https://www.youtube.com/watch?v=NtfmvwyHuNs