Of course ringo knew this (as do most of the posters on this forum). Just had a momentary finger-pokin' problem on the keyboard. But me, being a picayunish son of a bitch, just had to quibble and correct.
That's a good theory if you could prove it by observation, but since you have never been to another galaxy to observe this, or even outside our own, it is just shall we say opinion?
No, not an opinion. Now the logic and math behind this fact is way beyond you and you might strain a synapse just looking at it let alone understanding it so there really is no use trying to show you. Besides you are just not worth the effort.
However, should you decide to go out on your own and find the answer let me give you a small hint to get you started.
As we look out into the cosmos we can see the laws of physics working in exactly the same way we see them working here. Everywhere we look, no matter how far away in space or deep in time, the laws show that they hold.
[insert a lot of heavy physics here]
So, yeah, every point in the universe is moving outward from every other point in the universe. Every point. Each and every one of them. The whole universe. All of it. Quite cool actually.