Here's where our buddy Joe Smith got it from:
See right there in the middle, the little number 1? That's Kolob.
Now is it an actual physical place? Or does star just refer to a soul? Kinda like Lucifer being a star fallen from heaven.
If you think the first then Kolob has to be the center of the Universe, or at least the Galaxy. It is the star that governs all other stars. So our sun revolves around Kolob, as do many other stars. This also means that god has a physical throne somewhere where he likes to sit and watch us fight and have sex and worry about Mayan prophecies.
If you think this might be a metaphor for something, doesn't it seem likely that it would be Jesus who is nearest the throne of god and governs all the other stars (souls/people).
Anyway there are plenty of Mos that believe both things, so it's a little tricky. But to me this is no harder to believe than Jonah or Noah or Elijah (they're all hard to believe).
Oh, and by the way, Kolob is the inspiration for Battlestar Galactica's Kobol! Tricky Mormons slipping bits of their doctrine into TV shows. There are more BSG/Mormon similarities, but I'm just talking about Kolob in this post, so check it out somewhere else, cause I don't think I'll ever write about it.