13.8 billion years ago, the Universe began with the hot Big Bang. It's been expanding and cooling ever since, up through and including the present day. From our point-of-view, we can observe it for some 46 billion light years in all directions, thanks to the speed of light and the expansion of space. Although it's a huge distance, it's finite. But that's just the part we can see. What lies beyond that, and is that possibly infinite? Adam Stephens wants to know:
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