Star Ruler does pretty much what it says on the tin. And no, it's not a measuring device for celebrities. That'd be silly.
Where was I? Ah, yes. Star Ruler lets you command a mighty empire, create fleets and extend your reach throughout the galaxy; taking advantage of interstellar phenomena as you do so. However, I have to warn newcomers that the interface and GUI is patchy to say the least, resulting in some fairly basic control issues. If you missed Steam's epic £3.25 deal three months ago, this is the cheapest price around by a light year.