Our universe appears flat—but this observation still leaves plenty of options for its true shape. In fact, our cosmos could resemble a donut ...

The part of the Universe we can observe appears perfectly flat: this implies, among other things, that going straight ahead infinitely, one would never return to their starting point. The idea of a ...

Add Yahoo as a preferred source to see more of our stories on Google. What shape is the universe? This question is far more intriguing and truly unresolved than any debate over the shape of our planet ...