I believe the universe is infinite in all directions. There is no leading edge of expansion. Space itself expands endlessly. Galaxies exist in all directions infinitely: Look at the Hubble Deep Field North and South.
In a sense there is no Big Bang: The early universe was infinitely denser and hotter. The speed of light also appears to slow down, as one approaches the Big Bang in a recent study of black holes.
This in turn raises the existential question as what "13 billion years ago" really means.
I'll stop my little digression at this point.
Huh?