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 ...

In chemistry, molecules with a "flat" geometry are often stable enough to support a wide range of reactions. But in the quantum world, that's not technically true. Reading time 3 minutes Any concept ...

Our universe appears flat—but this observation still leaves plenty of options for its true shape. In fact, our cosmos could resemble a donut What shape is the universe? This question is far more ...