If space is expanding, why do scientists still talk about a big bang? The big bang theory said that something exploded into a space that was already there to receive that which was exploding. Now they believe space is created along with the exploding matter.
But the big bang isn't needed anymore if space itself is expanding. The objects in the universe could have come into existence separately, like crops in a field, or whatever. They all still would be moving apart from each other if space does the job of expansion.