In September 2015, the world of science experienced a sensation: researchers in the USA succeeded in proving the existence of gravitational waves for the first time in the history of physics. A milestone. This proof opens up a completely new perspective on our universe - perhaps even on the birth of the cosmos itself, nothing less than the Big Bang. Gravitational waves are created when something gigantic happens in the universe: a stellar explosion, the merging of neutron stars or black holes.