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Big misconception. The Big Bang -is- the expansion of the universe. Think about the surface of a balloon expanding... all physical matter is contained within the surface of the balloon, and the balloon is continuously expanding.

Now, the universe is infinite, just like you can wander around on the surface of the earth infinitely. However, current theory says that if you go in one direction forever (data points towards Virgo), you will eventually come back to the other side of Earth.

There is no center of expansion, just like there is no center on the surface of a balloon. Therefore the concept of a "center" to the universe is meaningless, just like there is no center on the Earth's surface. The balloon's surface can expand, without a center of origin, and the universe is the same way.

It's a non-inituitive concept, and you didn't learn it in school in this way... because, well, it's hard to get 12-year-olds to visualize that. It's so much easier to say "boom". Besides, the concept of the big bang works -against- atheism because a beginning is implied... not for atheism. People used to think the universe was eternal and all that. That's not the case now.

There is no center of expansion, just like there is no center on the surface of a balloon. Therefore the concept of a "center" to the universe is meaningless, just like there is no center on the Earth's surface. The balloon's surface can expand, without a center of origin, and the universe is the same way.

he universe of galaxies is shaped and is acting such that they are moving sort of away from each other like an expanding balloon. The universe has no center because the surface of the balloon has no center. But does not the balloon as a whole have a center?