Once upon a time physicists thought they had the universe solved. Some obscure details remained, but the basic structure of the cosmos was thought to be understood. Out of this naivete, relativity theory emerged, fundamentally altering classical notions of space and time. Then came Heisenberg's uncertainty principle and the surreal revelations of quantum physics. String theorists, in their attempts to reconcile ever widening theoretical gaps, started talking about eleven dimensions. Dark matter still makes no sense. Modern physics knows so much more about the universe, but their is still much it doesn't understand. for the first time, some scientists are openly wondering if we, in fact, are incapable of figuring out the cosmos.
(Image is of six-dimensional Calabi-Yau shapes)