The edge of the universe might be simply space that is expanding at a speed greater than that of light. It can be called an edge because it is well defined and cannot be crossed. Beyond this edge is more space.
On the other hand, the edge of the universe might be the beginning of a higher dimension. What's beyond this edge is space of the higher dimension, in which other universes (called 3-branes) are present. At least that is what string theory says.
It's all theoretical and not yet verified. Cheers :)
On the other hand, the edge of the universe might be the beginning of a higher dimension. What's beyond this edge is space of the higher dimension, in which other universes (called 3-branes) are present. At least that is what string theory says.
It's all theoretical and not yet verified. Cheers :)
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