Quite an old one that, 2004. 4X Space Strategy has a long and varied, if sporadic history. For more recent alternatives, try:
Sword of the Stars (turn based/real time combat; get the Complete Collection)
also Sword of the Stars 2, though it's still unfinished - wait a while on this one imo.
Star Ruler (real time/massive scale)
Distant Worlds is another oldish one, closer to Civ in space, easy to grasp but hard to master.
Just off the top of my head, plenty more though. You might enjoy
http://www.playscifi.com if this is your kinda thing
