The Big Bang theory doesn't propose a "center" from which the universe expanded. It's more accurate to say that the Big Bang was an expansion of space itself from a very hot and dense state.

Here's a way to visualize it:

* Imagine a balloon: The surface of the balloon represents the universe, and the points on the surface represent galaxies.

* Inflation: When you inflate the balloon, the points on the surface move further apart, even though no point is at the center.

* The Big Bang: Think of the balloon as being very small and then rapidly expanding, creating space.

Key points:

* No Center: There is no center point in the universe. All points are essentially equivalent.

* Expansion of Space: It's not that galaxies are moving through space; it's that space itself is expanding, carrying the galaxies with it.

* The Big Bang was everywhere: The Big Bang happened everywhere at once, not from a single point.

Analogy: Imagine a loaf of raisin bread rising in the oven. The raisins represent galaxies, and as the bread rises, the raisins move further apart. The bread is analogous to the expanding universe.

Important Note: This is a simplified explanation. The Big Bang theory is a complex topic involving concepts from cosmology and physics.