The big bang happened everywhere. Space is not a fixed size nor infinite emptiness into which the big bang poured matter. Space itself expanded from near nothin

The big bang happened everywhere. Space is not a fixed size nor infinite emptiness into which the big bang poured matter. Space itself expanded from near nothing to the universe we have today. The big bang wasn't a matter grenade it was the expansion of everything including space itself from nearly infinitely small to current state. This means that the tip of your nose, a distant mountaintop, Olympus Mons on Mars and indeed a distant galaxy were all the same space. Imagine a balloon blowing up with an ant on it. The ant can only walk so fast but the balloon can blow up expanding the space between ants in a way that is in no way limited by ant walking speed. Now that we are so separated it takes so long for light to get to us that we can only see the light that left billions of years ago from our frame of reference