The universe is constantly expanding... but what could be lying beyond the edge of it?
Cosmologists aren't sure if the universe is infinitely big or just extremely large. To measure the universe, astronomers instead look at its curvature. The geometric curve on large scales of the universe tells us about its overall shape. If the universe is perfectly geometrically flat, then it can be infinite. If it's curved, likeCurrent observations and measurements of the curvature of the universe indicate that it is almost perfectly flat.
But even if the universe is finite, it doesn't necessarily mean there is an edge or an outside. It could be that our three-dimensional universe is embedded in some larger, multidimensional construct. That's perfectly fine and is indeed a part of some exotic models of physics. But currently, we have no way of testing that, and it doesn't really affect the day-to-day operations of the cosmos.
And I know this is extremely headache-inducing, but even if the universe has a finite volume, it doesn't
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