So I'm just getting into physics to research for a short story idea I've had for a while, but I've got a few questions I'm having difficulty finding an answer to. As the universe expands, does space expand? Like, if someone took a marker and drew a small star on a balloon and then inflated it? The balloon would expand, and so would the star.... which brings me to my next question. If I'm correct and space is expanding, someone that wanted to time travel back to Roman times, would be going back to a time when A) the universe wasn't as spread out as it is today (the balloon is less inflated), so the earth would be in an entirely different place than it is now (not to mention a different place in it's orbit) B) Space itself would be more compact ... so even if they could get to the right place, they would be giants?... Clearly I'm a n00b, and really have no idea what terminology to use to even ask my question properly. So please don't be too hard on me for not making sense. If you could just direct me to a few n00b friendly books to read, I'd be eternally grateful.