Does the Universe Have an Edge?

Scientists now know the universe is expanding, at an ever-increasing rate. So if it's ballooning, what is it growing into? In other words, what is beyond the known universe? Defining this "beyond the universe" would imply that the universe has an edge. And that's where things get tricky, because scientists aren't certain if such a drop-off exists. The answer depends on how one views the question.

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