What is the "raisin cake model" intended to explain?

The raisin cake model was a design intended to explain the expansion of the universe based on the analogy of a raisin cake is cooked. The model is comparing to make the concept of the expansion of the universe easier to understand. As the raisin cake is baked, the cake expands, and the raisin is pushed farther apart. The cake is provided in fantastic proportions; the expansion looks similar no matter which raisin the observer sits on. Same goes for the expansion of the universe; the universe looks the same from every galaxy.

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