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Our universe may be a really huge three-dimensional donut.

Imagine a universe that can turn a spacecraft in one direction and eventually return to its original location. If our universe is a finite donut, such movements are possible and physicists can potentially measure their size.

Thomas Butchart, an astrophysicist at the University of Lyon, the French Center for Astrophysics, told Live Science in an email.

Our universe may be a really huge three-dimensional donut.

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