OK, don't get me wrong. I know it's the distance light travels in a year. One can easily do calculatons and get miles meters parsecs or whatever unit you want. But when we photograph objects close to 13 billion LY away, almost as old as the universe it seems to take on an artificial meaning. The universe was certainly smaller then and the early Milky Way must have been much closer to these objects when their light left to chase us. As the Milky Way raced away, the light stayed in hot persuit for 13 billion years, finally entering the hubble telescope lens. But since the source object has likewise been racing away in the opposite direction and since space has been expanding, it too must be much further away than 13 BLY. So what does that 13 BLY represent? It's not the distance apart we were when the light left the object, nor is it the distance we are today, 13 B years later when the light arrived. It seems to be an artificial distance that says, if that object had stayed fixed (which it hasn't) and if space wasn't expanding (which it is) that object is 13 BLY away. It's tough to wrap my head around this.