I have a question sort of related the size of the observable universe. I know that we are limited by the speed of light in how far we can see, but what I am wondering is... In the early universe when the first light could finally break free and travel in straight lines did it travel in all directions like the light given off by a star, and if so could there be light 13.7 billion light years beyond the horizon and we just cant see it because there is nothing to reflect it back to us? Would this have any importance or relevance of any kind? And is 13.7 billion light years the distance across the entire universe or just from our position outwards in all directions, making the universe around 28 billion light years across?