kingkit: the universe did not go to "full size" in a fraction of a second. In that first second it expanded from zero to about 186,000 miles in radius, as you suggest. Think of a grenade exploding - the shrapnel expands away from the center at essentially a constant speed. So too with the universe. And it's still expanding. The radius of our universe is essentially 186,000 miles per second times the age of the universe (about 13.8 billion years) which works out to mean the furthest objects we could ever see are 13.8 billiion light years away. And every year that distance grows by another light year.