Home-world, and home-world 2 were both space based ship combat RTS games. Home-world 2 came out about 7 years ago in 2003. This is one of my favorite games of all time. (in fact I still have my home-world 2 CD. I am looking at it as I type) Plus it is arguably one of the greatest space based RTS games of all time. I would even conclude that it tops many of the space based RTS games of today.