The spectacular view into the universe before the Big Bang! Until now, the Big Bang has remained the last frontier that no physicist could cross. Even for the General Theory of Relativity, this moment is considered a singularity that cannot be calculated with its equations, where the laws of physics are no longer defined. This is where the universe begins for us. But what was before? The young physicist Martin Bojowald has made waves in the scientific community because he has managed, with a series of equations, to get closer to the Big Bang than ever before and even beyond it. Suddenly, insights into what existed before the Big Bang have become possible - with astonishing findings about an excitingly unknown world with negative time, inverted spatial relationships, and a cosmos that contracts to expand after the Big Bang.