**Ron does not seem to have noticed that 2016 is the centenary of the derivation of the Schwarzschild solution. This was the first exact solution of Einstein’s field equations to be found. It is the unique solution for the empty spacetime outside of any spherically gravitating source, and is the basis of most experimental tests of General Relativity. It is also a very good approximation of spacetime outside of a sphere that is slowly rotating or which is slightly deformed. It describes well the gravitational field outside of bodies such as white dwarfs, neutron stars and black holes and predicts the effects of gravitational lensing. It is difficult however to interpret properly some of the observable effects without having a profound understanding of special and general relativity, and the effects sometimes seem to be at odds with both common sense and with introductory physics textbooks. That is why loonies like Ron and Crothers think that they are needed, and have a better grip on the subject. They are not, and they don’t.**

## Centenary

Advertisements

## Leave a Reply