Structure and shape of the Universe

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In fact what you are saying makes no sense. Explain it more thoroughly.

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I know its a radical idea, but we can just actually answer the question, you know.

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If BIG-BANG theory is correct, then the shape of the expanding universe must be a hollow sphere with all the matter concentrated on the outer shell.But how come the structure of the universe is believed to be spacially homogeneous?

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There is a particular model that often seems to produce this misunderstanding. In a different discussion about the expansion of the universe subsequent to the big bang, a simile is often given with points on an expanding balloon. Taken literally, this is often seen as suggesting that our universe is the rubber of the balloon, and that hence the universe is hollow. But that is a weakness of the simile, rather than what it is actually trying to communicate.