... which is expanding. So now you have a percolation problem: what grows faster, the bubbles or the universe? The latter is also thought to be expanding at an

... which is expanding. So now you have a percolation problem: what grows faster, the bubbles or the universe? The latter is also thought to be expanding at an accelerating rate, which leads to funny scenarios like this: https://arxiv.org/abs/1503.08130 https://arxiv.org/abs/1503.08130