Abstract
At the end of 2015, the scientific world commemorated the centenary of Einstein's general relativity, one of the most remarkable physical theories ever. And the celebration was spectacular - at that time, for the first time, gravitational waves were directly captured by the LIGO observatories.
As it turned out, the source of GW150914 was the collision and fusion of two large black holes in deep space. It was thus a dynamic ripple of space-time, caused by the collision of a pair of gravitationally completely collapsed objects, spreading through the expanding universe.
All the great predictions of Einstein's theory contained in a single observation! The general theory of relativity triumphed again! But every ruler must always be confronted and challenged to a fight so that his legitimacy can be confirmed on an ongoing basis. This is true in politics, sports and science.
One hundred years ago, in 1919, Kaluza and Weyl similarly challenged Einstein. However, it was not a ruthless battle, but rather a collegial effort to further develop and generalize Einstein's theory.
Their ideas are still being worked on intensively.