For all we know every 15 billion years a universe worth of matter springs into existences blowing the existing matter outside of our visible universe. This is

For all we know every 15 billion years a universe worth of matter springs into existences blowing the existing matter outside of our visible universe. This is a contrived point but we don’t know what the universe looks like at really large timescales beyond our visible universes birth. It could (and likely does) get weird.