Question

What are the implications of the three main types of geometry for the structure and fate of our universe? (That is, what does it mean for our universe if its overall geometry is flat, positively curved, or negatively curved?)

Why are 2-D and even 3-D models not the best for describing our universe?

Some scientists (especially string theorists) have suggested there are higher dimensions. Why would higher dimensions need to exist in their models?

If the universe does expand forever, how do you account for conservation of energy (i.e. energy at the beginning equals energy at the end)? There is much debate about this question. Support you answer with a reliable source.

Answer 1

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